Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b976f3d974931a9…

MALICIOUS

PDF

81.5 KB Created: 2021-06-13 11:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ee18a8af8efd635c208e70753e27a47 SHA-1: 5beab433c7371e40a2f689e6aa1ac6552febcf97 SHA-256: 5b976f3d974931a95112162d9b0f66683faa470cf8a90dc4f761038865818a2f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=zombies+in+spaceland+ee+guide
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f6fdd0d1d---50737677586.pdf
    • https://aquafilling.com/userfiles/file/29488746640.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/989815fd0f9d99b64a831075dee23795/gapizubupugosomuwajimitu.pdf
    • http://alpha-cp.com/userfiles/file/bifajodurezaz.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8f415bc8---75270814393.pdf
    • https://actorconseil.com/files/file/67974402872.pdf
    • http://mousike.it/img_ins/files/wafixur.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083942b800f4---83873654062.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c86087b81cdfb9d8e55051b4d576c0d0/23130181776.pdf
    • http://bannails.com/fckeditor_userfiles/file/xokitinigugojir.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8363ad45---26576341093.pdf
    • http://runo34.ru/attachments/file/totopunemuzef.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a980d2115---mejawu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd1.bin
ae09d34da22b028214c06f643e89afd0c50fb633fea190f4b6125e8dcd63fdf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 5196 bytes
font_01_sfnt_off00010156.bin
330aa813aa14ac6fc4479618928cbdb824a40599b200194159761b3c215bef0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 11896 bytes
font_02_sfnt_off00012953.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12953 4324 bytes

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