Malicious PDF — malware analysis report

Static analysis result for SHA-256 c397ea08cee12675…

MALICIOUS

PDF

96.0 KB Created: 2021-09-07 15:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c1b97bb0c410b6fd5bd0160b160383d SHA-1: a88afb1e7e78dd4657ce71b2b1507845f4d0f46a SHA-256: c397ea08cee12675dd443bac7daf71cd4074b65507027846a6094d8b78bb23e9
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious or phishing sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8428

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://anmimar.com/royal/userfiles/file/vavarupesumobapinasirow.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/99996580394.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3c5bc3494a1a09c0f02e19b806f26471/lurapewifegeji.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/34622373098.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf2648aea---boxeraponojenurotivalikis.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/32b2226a0875856740fce8f3332dc9c7/57688504409.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf409714ec3---68848823407.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094234976aa0---lisijowarijebejuvenapasug.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/subalafobiturewiwu.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/nuwunogag.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/kaniku.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/dogegamenexujis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fundamental+counting+principle+worksheet+kuta+softwarePDF link annotation

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