Malicious PDF — malware analysis report

Static analysis result for SHA-256 a735845bb5409a0a…

MALICIOUS

PDF

112.4 KB Created: 2021-06-06 09:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ba7cd83d8ada5c1a2bd366b4437a89a SHA-1: 337e8c570e48ca26d88f03bd5c9b2f836f8c4663 SHA-256: a735845bb5409a0a53987c251b1a08edfd552aaad41995743ad51da278ede4d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9115

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=1994+suzuki+quadrunner+250+carburetor+adjustment
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ad84d144d6d13494af95bb5f1ee8522a/naratavolovoxu.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad893bb0a09---taparewikivuf.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/11bd4720257fa65c0116e5966c9a2a55/gafumudewodopafok.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160979db8cded7---46728058395.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/88991931608.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/29pd6027hn53cdigse34v9t78d/13811082498.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e02fe6140cbc3ab49436f751fd1838a9/78029971507.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/rupokoxovepog.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630af0ed30---vizadawotapoki.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/ce5f33264764cbcb5c940c0a6928b75e/wamunijitonulijawuzefa.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/4d42383fc7898af6b753d09464b131b1/70673676352.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076da9e555e8---beliriw.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d952b8a83---jadidamupox.pdf
    • https://ferado.vn/userfiles/file/nudobexowapedewalore.pdf
    • http://mikailang.net/userfiles/file/20210504085256_1478819199.pdf

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