Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e88cb89fc86d10…

MALICIOUS

PDF

60.2 KB Created: 2021-06-12 19:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecb8ee474035e39b378f4df3452f6bb3 SHA-1: 3d673a8a63b60e18df76937289f44bf900dd069d SHA-256: 92e88cb89fc86d109a4dd966314c48939868ecd20578fbec4d5518e441850605
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to external websites. Several of these URLs are hosted on compromised WordPress installations, suggesting an attempt to leverage legitimate but compromised infrastructure for malicious purposes. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7016

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://chcial.ru/uplcv?utm_term=whens+the+next+basketball+game
    • http://fixafilm.se/userfiles/file/geluderojuma.pdf
    • https://anmoul.com/userfiles/file/56468607261.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2fd8a5bbd01027b7e0a753baa641ca50/85610546572.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c3649e9b---dutotolet.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9db465974---xoterinopiwokokojo.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160743a4817190---tajolepupapuzapebewuka.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/6c221ad5e2b9cfa76107bdcd27ba91eb/68318189368.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5140ea4ff504d0b6861b6f0c03d3b200/zafizuvidanujowoga.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a5e9mdomnlmcdefiok5c6dgd81/85976233669.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986832663fc---rejowizamabikomag.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b607b0c54e6---putujopupabi.pdf
    • https://naoshima-habitant.com/77786350471.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3h4s5tf5rnph7sk4a7ucipe709/mikokozotugufozudikepa.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e907d672ef---63292296873.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab09b90753c---98141760128.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e7eb9e88---20915082897.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dad7e0d24---kipefuj.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/82372927724.pdf

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