Malicious PDF — malware analysis report

Static analysis result for SHA-256 af868e43bc7f63f0…

MALICIOUS

PDF

67.5 KB Created: 2021-05-28 16:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d557a1687c5cfa23fa2d8e667c90ecf2 SHA-1: 402464dfd208e9543226ed7c9444976895fc44e3 SHA-256: af868e43bc7f63f05d446f701b356fcf11433cc9fa93474b5512c3540c615fdf
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised CMS uploads and disposable hosting, designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful content.

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://modnyi-buket.ru/uploads/files/70282028985.pdf
    • http://www.allatpatikapecs.hu/images/file/visudag.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/3490411844f842a1992ebf7e42fbd1a0/12709368503.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/sq5sumb0fh2u2smcjrnc34ffu4/poneliboju.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/53ekt3orpcvjpaloojk71pbbo0/5815905430.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1672ea7ca06000a5b5f0a9a206beaec0/xefiz.pdf
    • http://adamlegal.com/userfiles/file/13146033659.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1de23976f---43093387015.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnf55oq9qdfod0bvkfl0n5m3n6/penasuvaraxivelolura.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-16/20210516223433515931.pdf
    • http://goref.ru/files/file/34473297359.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2668be31---tabasotozunexov.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac911ca4d---javexelenobikaz.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/cor6r30o4eal78mkfb7dp8m2gv/42725009289.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/6c0a2078dd5f8ec1ee25f2850d548931/14667449762.pdf
    • http://tafgambiatours.com/userfiles/file/sevuwovuvonukon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+7.4+ph+phosphate+buffer
    • 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_off0000c833.bin
767ef7815b227ad1c17cb71a3d22e3d6d5f6ef94e5e3627e03050ff7dc671b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 5564 bytes
font_01_sfnt_off0000db10.bin
0f500786db62c2b0db930331c0d665d32a6372ccf904f702ab1c7256c925df66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 10716 bytes

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