Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e8e6d0d9337c24…

MALICIOUS

PDF

63.6 KB Created: 2021-08-20 22:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27b5a44b7cdb998b334d0e9767a5029b SHA-1: 4bb1edc36cd6366bdd2cc5fe10924fa63afbfce5 SHA-256: e8e8e6d0d9337c24ed54a08b29f4b06e478cd96a69fdbbe9a73a03a7257cec93
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple external PDF documents hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7755

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://tidaksusah.com/contents/files/vasusumokutesumiwi.pdf In PDF document text
    • http://mvdeastudio.it/userfiles/files/50407153668.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/zexulamajoz.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1a8e7413061ffb80dafc8419854898f6/wanafekejazitezar.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/33446537444.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebd2bba7ac---89411300756.pdfIn PDF document text
    • http://medrea.ru/upload/files/32844835405.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/katinewerab.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fe14afd6c858d32cec13cdb7ec6fc395/navazeduvavaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=english+spoken+book+pdf+free+downloadPDF link annotation

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