Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ddc80c254c274…

MALICIOUS

PDF

69.2 KB Created: 2021-06-12 17:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 962591d708a3fad56afefec29e579fc3 SHA-1: 31c932aa877bc9b6a16d0c85157330ae5c0558f2 SHA-256: 5d4ddc80c254c2742368d454d8a6d31a24ff83acb96c88ab90cfa89f2e1dd933
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to phishing or malware distribution pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=hemming+uses+a+periodic+inventory+system
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/601e1971870dc677f6db650adadacbbb/73770099535.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3999196d748c6f2e92eed702bc51c4cc/53391879898.pdf
    • http://thedewakohchang.com/image/upload/File/uxikogulokuzoritu.pdf
    • http://harasim.cz/uploaded/files/dibepidugijajikipiseg.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7e06d8f3---15070707753.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae7d5c122---31497069312.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b473eb82---vixobupotopoba.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/af002bdfcfb1673139539936d1b2afd0/lolikamolu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6df2b749---zexegipomen.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/f66c4230711557711d024a11ed1e008a/budivalolesefu.pdf
    • http://wmc21.com/ckupload/files/66174111574.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/34baaeb22a91d4ae17505d137ceb7e4b/93448899886.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000cef9.bin
fe05ef9686b51df02a0acfb45ebf37bb42f7b680df286bd6ed2bfd31594ae662		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 5484 bytes
font_01_sfnt_off0000e198.bin
e5970518ecedb3af7e74e1dc220498598e9105a6b20fa719b3e82ceee3e52100		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 11300 bytes

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