Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fad4eaa1bd7499…

MALICIOUS

PDF

38.6 KB Created: 2021-09-14 07:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39aeba904d67bf7e55fe1cfe726e5d1c SHA-1: d0070725b4f8925e578367f52d3b58a0c563d0e4 SHA-256: 85fad4eaa1bd74992841a0ff039f812239648966a527f8f917545d9d46b1c13c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded clickable links. The document body is heavily obfuscated, but heuristics indicate it's designed to present a screenshot that hides an action trigger. The numerous external URLs, many hosted on compromised CMS platforms, suggest an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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 https://archism.ru/uplcv?utm_term=top+video+calling+apps+for+android PDF link annotation
    • http://giasudaihocsupham.com/Images_upload/files/paduxefemugejor.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/04be77c228533467f9393c8b3cd6754d/bapaboponu.pdfIn PDF document text
    • https://majubesar.com/contents/files/57153830369.pdfIn PDF document text
    • http://metallpress.info/files/xofojam.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fb568acd---58050422323.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/vejige.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/sofegigidufogesixalebibu.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/86787098601.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/tegepinagixovotolu.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/jamijalofodigonekoxo.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/gimejupeb.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/nasifuzaxugekujigalixirod.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109121816098309.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c69b98b990---71689766313.pdfIn PDF document text
    • http://sharon-barron.coIn PDF document text

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