Malicious PDF — malware analysis report

Static analysis result for SHA-256 cccbccaf8a9941a6…

MALICIOUS

PDF

72.2 KB Created: 2021-06-02 09:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73aaffafbbc74c79fa734a7e7195507d SHA-1: 55e09b2ec473cc8719ec88e9b6c76fe993ee96a4 SHA-256: cccbccaf8a9941a6a405ff604a511966b6244a91838acc498e67cb46b6e4ee04
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ekolojikweb.net/upld/userfiles/file/nexeforozo.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c957b25e70---jovesoziramosokiwuvubimi.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f15d49e3d---39554636506.pdf
    • http://imbirimbir.ru/files/rawin.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/rukenevoluxuzaxaruranovit.pdf
    • https://planet-for-events.de/userfiles/file/7792345934.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/fsnma2ar9uoav8un5765cupb4k9qs0qp/35376822933.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17c4c43dd---fominivimisoni.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc68768e8d5820bf6e995dc97b8ef457/wewatu.pdf
    • http://accessiblevehicleservices.com/userfiles/file/retisonenafoxim.pdf
    • http://elite-nails.pl/Upload/file/99059288256.pdf
    • http://thingsantiquesla.com/userfiles/files/66373553256.pdf
    • https://aawyx.com/sites/default/imageuser/file/gakox.pdf
    • https://susta.vn/userfiles/file/wufop.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9c75729b---tiwinadiji.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cc8a5286---59830151633.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4eddai2khaqmjko8q8u430a698/76021636799.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+clarity+in+minority+report
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ad.bin
fce8f210fcca426b894a042b1ce78f30f5d3dd52ea562f07ca5dd5a45ad097fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 5288 bytes
font_01_sfnt_off0000f48e.bin
bee054b03ebf6c737f46e51221ccfa8170d401911d14103eae969a5520de49d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 10568 bytes

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