{"id":10384,"date":"2026-02-04T10:03:49","date_gmt":"2026-02-04T10:03:49","guid":{"rendered":"https:\/\/serisec.com\/index.php\/2026\/02\/04\/beware-of-fake-dropbox-phishing-attack-that-harvest-login-credentials\/"},"modified":"2026-02-04T10:03:49","modified_gmt":"2026-02-04T10:03:49","slug":"beware-of-fake-dropbox-phishing-attack-that-harvest-login-credentials","status":"publish","type":"post","link":"https:\/\/serisec.com\/index.php\/2026\/02\/04\/beware-of-fake-dropbox-phishing-attack-that-harvest-login-credentials\/","title":{"rendered":"Beware of Fake Dropbox Phishing Attack that Harvest Login Credentials"},"content":{"rendered":"

Beware of Fake Dropbox Phishing Attack that Harvest Login Credentials
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Cybercriminals are launching a dangerous phishing campaign that tricks users into giving away their login credentials by impersonating Dropbox. <\/p>\n

This attack uses a multi-stage approach to bypass email security checks and content scanners. <\/p>\n

The threat actors exploit trusted cloud platforms and harmless-looking PDF files to create a deception chain that leads victims to a fake login page designed to steal their credentials.<\/p>\n

The attack starts with a legitimate-looking business email that appears related to procurement processes. <\/p>\n

These emails contain a PDF attachment and ask recipients to review request orders by signing in with their credentials. <\/p>\n

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What makes this campaign<\/a> effective is that the email body contains no malicious links, allowing it to pass authentication checks like SPF, DKIM, and DMARC without raising red flags.<\/p>\n

Once the victim opens the PDF attachment, they encounter an embedded link that directs them to another PDF hosted on Vercel Blob storage, a legitimate cloud infrastructure service. <\/p>\n

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Staging PDF (Source \u2013 Forcepoint)<\/figcaption><\/figure>\n<\/div>\n

This staging layer exploits the trust users place in well-known platforms. Forcepoint analysts identified<\/a> that the PDF uses specialized techniques like FlateDecode compression and AcroForm objects to hide clickable elements while appearing harmless to scanning tools.<\/p>\n

The cloud-hosted document then redirects victims to a fraudulent<\/a> website that impersonates Dropbox with a familiar login interface. <\/p>\n

The fake page mimics the authentic Dropbox design to convince users that they need to enter credentials to access important documents.<\/p>\n

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Social engineering attack (Source \u2013 Forcepoint) <\/figcaption><\/figure>\n<\/div>\n

When victims input their email and password, the information gets captured immediately and transmitted to attackers through Telegram infrastructure.<\/p>\n

How the Credential Theft Mechanism Works<\/strong><\/h2>\n

The fake Dropbox page contains hidden JavaScript<\/a> code that performs several malicious functions. <\/p>\n

When a victim enters their credentials, the script validates the email format and collects the password without any minimum length requirement. <\/p>\n

It then gathers additional information by fetching the victim\u2019s IP address and geo-location details including city, region, country, and internet service provider through external APIs.<\/p>\n

All this collected data gets packaged into a message and sent to a Telegram<\/a> bot using a hardcoded bot token and chat ID. <\/p>\n

The script simulates a login process with a five-second delay before displaying an error message, making victims believe they simply mistyped their credentials while attackers already have the stolen information.<\/p>\n

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The post Beware of Fake Dropbox Phishing Attack that Harvest Login Credentials<\/a> appeared first on Cyber Security News<\/a>.<\/p>\n<\/div>\n

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\n Tushar Subhra Dutta
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Beware of Fake Dropbox Phishing Attack that Harvest Login Credentials Cybercriminals are launching a dangerous phishing campaign that tricks users into giving away their login credentials by impersonating Dropbox. This attack uses a multi-stage approach to bypass email security checks and content scanners. The threat actors exploit trusted cloud platforms and harmless-looking PDF files to […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[129,63,649],"tags":[130],"class_list":["post-10384","post","type-post","status-publish","format-standard","hentry","category-cyber-security","category-cyber-security-news","category-threats","tag-cyber-security-news"],"_links":{"self":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/10384"}],"collection":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/comments?post=10384"}],"version-history":[{"count":0,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/posts\/10384\/revisions"}],"wp:attachment":[{"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/media?parent=10384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/categories?post=10384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/serisec.com\/index.php\/wp-json\/wp\/v2\/tags?post=10384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}