Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f95d0923cacb2e0…

MALICIOUS

PDF

38.8 KB Created: 2021-09-27 19:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 20794dcfe45eaf394ceef6ccdb36a1c5 SHA-1: 3d9b470b77c55fd70fea5bd11dad5a622b53bd51 SHA-256: 5f95d0923cacb2e0fb60c1f03473341aa8ce97e9885e537e3850805d1c1745a7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF employs an image-only lure, a common tactic to trick users into clicking embedded links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a delivery mechanism for further stages.

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 https://crysiq.ru/uplcv?utm_term=walking+dead+michonne+all+episodes+unlocked PDF link annotation
    • http://divapharma.com/uploaded/file/lokun.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/75286805326.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/nelaluzidape.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/36584924563.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe21c86266---xajuxi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613719154fa2e---bimibokopobozozorusol.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/xexutodukazexusafu.pdfIn PDF document text
    • http://104450wp19.agentcentrum.com/userfiles/files/wuladuriz.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/bokaxuxetakurobopisuza.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f895ae0026608d12f79e8e93a36c7c84/tumaj.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/zasogibejesegusomij.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/31154523657.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/89915906200.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/81089In PDF document text

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