Malicious PDF — malware analysis report

Static analysis result for SHA-256 6739bcf35f246f39…

MALICIOUS

PDF

74.2 KB Created: 2021-08-15 02:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: cad45c2dd260a7397c1dbec227410f46 SHA-1: 88d33910364be5ff93f387d9f03f9f7970ad6273 SHA-256: 6739bcf35f246f397ba463918ab11b2540d6c3a749de26ea59979a29e1eecb82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6661

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=acgih+industrial+ventilation+manual+27th+edition+pdf PDF link annotation
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/mg6bomegdopiaefl97tickb2ji/61272646399.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3946d2965---litadurawefubadinob.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b7883de7---32817633800.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/3790903880.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/bobolunilozigix.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/4134706584.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c28eb43d0df---17211937692.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d4c3314c93ed77b07af199d5b8d38af8/ropufukuz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608070c56fc17---febuponogiposivi.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/84768209963.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/susos.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bbb84a07efb5318e57884c7a1ca22aac/jinajowekazefiki.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bcbd56728477db5bc45ab69d881d9885/dapan.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/208c4d14a848cbb7442868de740546c8/mimami.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/01e329be405a6a055668009339a8338d/sagefolap.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/64127554480.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/10626429067.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/59983115989.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8bf2096e07d4a7cd6877da9ac6771c33/85594637008.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/podevoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e78de3fbf---72922312296.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/lorudesiwemi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28fd610971---gukezozat.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16084279b9f3f9---8828818266.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 11384 bytes
SHA-256: aaaad389fd8580fab35d19f8537657d884a26b343020b657cf87713e03fb6def
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1