Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d91234faa4b529a…

MALICIOUS

PDF

38.6 KB Created: 2021-06-30 10:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af5f7533f8f7c2e6acae2061ca4d94b4 SHA-1: 25e1eac3883f6847b896bc7deee891873c76059b SHA-256: 3d91234faa4b529a86b46576d130270b32e8c27057bfa314adbe1fa3c888daa4
174 Risk Score

Malware Insights

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

This PDF was identified as malicious by multiple heuristics and an ML classifier, with ClamAV flagging it as a phishing trojan. The document structure suggests it is an image-based lure, containing numerous links to potentially compromised websites and disposable hosting, typical of phishing campaigns. No scripts were extracted, but the presence of multiple external links indicates the likely intent is to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 38 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://say-international.eu/userfiles/file/tapaxagubalugajesufasepi.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210622171036409.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c5ff873711820f7db64a115b861fe32d/83538327856.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ce0d196c---80314480422.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/mamazofoxipigas.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/20800640343.pdfIn PDF document text
    • http://info56.ru/userfiles/file/66111537551.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/38373579491.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607852ad0330d---sifiduzazepiviwasokoriv.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/94e72111c47b2af2444a55a2b62c26ab/juvixe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e30db1303c---dilirubejobe.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b9aef94a---39424503244.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/babipudisamenadod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=girls+in+small+swimsuitsPDF link annotation

Related samples 8

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