Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f08f937f358b667…

MALICIOUS

PDF

54.7 KB Created: 2021-05-25 06:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 605a77c9f75709254ac24b73f03bb5a0 SHA-1: d230b85c710016a3072416eb102e2ed8d55ebf67 SHA-256: 8f08f937f358b667f0b3006dcc0d8ac63625801457ef049a86a43c02fbb9ed6d
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a tactic to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body is heavily obfuscated, preventing a more detailed analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641bf8d580---30071340165.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a54a4993979---8743577857.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/8d0f96af844ce35c8a8d13b6ff1edb17/33653388361.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/68610058189.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8b4b86cd8---69301885206.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075abbfdd870---pelakovijinuzotoxesava.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6a4bae97---fumuvivodopopabap.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820dc0d2aac---35445653488.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/95d2e9ce527c2618bebc52a2df72c906/45165470984.pdf
    • https://botorka.ro/userfiles/file/zexize.pdf
    • http://cuatro-pr.org/sites/default/files/file/nosanafimuberufitaxober.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e713eb86---lilajazilefumitug.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160799cd195277---wivetofixekemesadok.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc88d5650---zowuwawegatif.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7dc4db96---21905386934.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dymo+labelwriter+450+how+to+change+label+size+mac

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