Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aabd8c032f2a600…

MALICIOUS

PDF

130.4 KB Created: 2021-05-02 20:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b4441007e723b48d5f94e8f65fce1c SHA-1: e507597b7cb9b848a1ce28e2a923c4b774274299 SHA-256: 0aabd8c032f2a60009916fdd1cb6c00ab6731e0c733396dc8be4f17388281596
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern that leverages external resources for malicious purposes.

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 https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcb5c5006---xemakejadowimuv.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a738188076---xogiwisiwev.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54a718993---96442648921.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/o73si72k2et8fkkg6nferk4qu1/zesubav.pdf
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/99eb6686702f6df3482f6487c82ec20f/bafedotuboragebidubemam.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29cf7e6b6---18409016385.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5a1071ba---35284988835.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac6e05d6---jutidomok.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/cc991c92a2feb516cbd7fb9d9df57c78/98192228808.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f437eca48---redevijuzoro.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/590725e47f3a9bf6e13fa44480d6161b/89194041464.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072178b78eb9---rixadotonimido.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gl0cjvajabksvnkecpfs9d4fu6/16608495321.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/93leri2t1ifqe8t8e20jes24s7/18234636932.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/ff03ce293b2164579ea4572b41ec0f21/21330439113.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/932c614971fade83510274c4479b29ef/zimenugavomu.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pci+dss+compensating+controls+worksheet
    • 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_off0001bb72.bin
8e2c5687292564edcd6c553e59072112f261c8bd7df75c29beef053f6de12315
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB72 1856 bytes
font_01_sfnt_off0001c38d.bin
86e88f5ab2847c2cd39e5efdc7b12bfbb05b52668694cda0e45765f903c95536
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C38D 5644 bytes
font_02_sfnt_off0001d6a3.bin
59c120b9b9a7818414223929b176c173802d48971793e5f5a4553e41d09e3d67
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6A3 11032 bytes