Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c86b66b8451afc2…

MALICIOUS

PDF

55.3 KB Created: 2021-05-21 10:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9638a4b9325da7f0ca85e47960a55c2e SHA-1: 4b1bca4c0b827a0d1cdd109eb3431a7a349f1116 SHA-256: 3c86b66b8451afc293a585723132d7010054aa058ac0b649f96fa164c369c548
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, acting as a link farm. These links are likely intended to lure users into downloading malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=cadillacs+and+dinosaurs+mustapha+game+download+free
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e25a1df2b360f4f75fabf74e53088b39/21234423834.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/aeecd5e58d4c60b70b1165a6f127f4f6/zafupiraketem.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sjo8tjhrb0a5n53u6o55t28v7i/dikapupawumatufo.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fe92a707b33a098fe7cda8630cba70b2/60844351076.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/7iquntjc01cs9qs90kfksbekls/22769140629.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac463432e---71203818980.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d88aa563ce5cb489efa150eae48b935f/11071842026.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20311ac6d---50550123600.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607713103f872---33745503338.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835a20662d1---vabidanisikojuf.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7056584b---togus.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c8e27da0---wogux.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/62306ff59542aa2f0281c9d50720cabd/10502977787.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d17f82efb---17813284984.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8ec44b492dd95da1feb0a200481890e6/28801968059.pdf

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