Malicious PDF — malware analysis report

Static analysis result for SHA-256 7defbb689267cbd7…

MALICIOUS

PDF

76.1 KB Created: 2021-06-02 22:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3d851aab89d74f8cfd92ef7675ebd22 SHA-1: bb74a3cc49485ccb14bc5ecf483ec517c8e8769a SHA-256: 7defbb689267cbd7418d81d0bcdcb57a8a2a8c6a6e11edd5f547ee6d27cf06f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d93429d0---41324291163.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1oip4ttonsjr46hjv8d1hh4mec/70671252892.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/08f122bef4ec2cdf750ea6a7c1838aa0/94681355261.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0ecb38089312ece9fc69f3e68ab2b618/73018168515.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8c668f7c78bcf6460e5333bc541cd5f5/11507586210.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/357e6e776579d5990ed5b16b8834647a/17713537529.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca3adf267---69406416617.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b243e0a9e57---70959258062.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jquhfpmqecoj0lkpu0tpkarou6/40184704338.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/95f9ca51d05d0233877053d0ac609639/55880243806.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5963429c2---93839962399.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9144ac20d68d10bf999c6cdf601a4839/43728215459.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/roboxakenubawulufajo.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbae63b47---61111518733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+automated+teller+machine+%2528atm%2529
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebef.bin
7dc24a8a2ee7271847714178b43fc0ac0aca01da82a192a830778d7b3266042a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5348 bytes
font_01_sfnt_off0000fe06.bin
5606426bb84282f9c7cf1a7f2caafadc531610f73bf93937bd571bc6f0973cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10988 bytes

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