Malicious PDF — malware analysis report

Static analysis result for SHA-256 1617f86047502d5f…

MALICIOUS

PDF

63.7 KB Created: 2021-05-12 22:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e271e392535b052e110e32d4cc17cb SHA-1: 1f2ed0102af90b4821fa6ed4189f10f00516008a SHA-256: 1617f86047502d5f05ba4ea04e77c0a585c72fd24cfc9e8ce743f3c7d969a412
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The document body is heavily obfuscated and appears to be junk data, suggesting the primary malicious function is within the embedded links and PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

Heuristics 5

  • 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
  • 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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ac5bdc15---lusolitowubutawog.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076bf454cced---83230819313.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6740cd28---bilegijiruja.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/db234218b079dfeb46206fc04d66bf81/daritupudo.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa4c47e90---xibadutunawukovo.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835c18ea3a8---xefajamidi.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/13cfdddcd3004436692eb5e89064af33/96099960123.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9e3508eb---zukema.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609550c5b4382---sabimafuxibifebaz.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d20603bef---90491359276.pdf
    • http://aggengr.com/uploads/CMS/file/39347541888.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/07bc371e88dd4860e20906cc6c49cef0/61832688045.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/6sen123r7jc4cof87jk32dm5hf/totanokukepibowaniwal.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/umdh7dmmajfjcahr7erjfmnb76/95736032688.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077298f82999---1103180045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nightcore+songs+list
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4cc.bin
e73c9753e19ffadbd676b93316fb32cab1077cdc993e2f50c10c8a69d0d88eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 4608 bytes

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