Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea9635b01c6ddc4…

MALICIOUS

PDF

65.1 KB Created: 2021-06-22 17:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a6820a37b1a63941525030d9ba795387 SHA-1: fde4b1a91b996357167879c4810ce97d5a8b66ed SHA-256: 9ea9635b01c6ddc4fca16e0f9ca2bd7f39a53c3d74a2726bd58516e6e480178d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8835

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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072575f85840---zadikakunodinazulo.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b9108adfe1ff3cc06c365ee2d59a4bbc/84454387080.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0f438ecd---xosapaxudegubenima.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efdbe9c5ae---bixolufotu.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf53aac5422---33828671280.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/zexesekegaduvu.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zodesiruwafewesuf.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924230cf48d---nofalaza.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c3b8f16b---kuwageluponisitobedu.pdfIn PDF document text
    • https://isleo.com/i_photos/file/lefesaramoja.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/neremu.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/futimagopubeveg.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/6837515086.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/49495709967.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c710c0105e---wulikujiraverojop.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/42e986154fefa914f0d6bcbd75aaf8d6/33503086504.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a103a2f12c0---wepipojupesapinikosud.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a47b7o41nch0k4s6p0hj3i9es2/betorotukelimomax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=railway+maths+book+pdf+in+englishPDF link annotation

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