Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eef8a20d5e90d58…

MALICIOUS

PDF

78.7 KB Created: 2021-06-12 23:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5fb13f667f9d1c1f3d094275c558fea SHA-1: 948e937e58e119c90e7a939dd098bf965cffd499 SHA-256: 5eef8a20d5e90d58e7d43e986aea6012b8eec8a392d98b486482fe96d42491c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. No scripts were extracted, but the heuristic firings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=present+simple+and+present+continuous+exercises+test
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/945c8e9b9d6cb5766b8202c876ac5e94/17395107405.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ir9naok42eg0bcl43ijrle50e6/bovikumaxaju.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b91352564c---pajewolagogekexujasatex.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/859c9952b47d6e5fc49fbf709b075a95/nonisu.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2981ddd70d99c45a8a1859188cbc9741/repikises.pdf
    • https://immobilgold.com/file/rivopasopaduxurepaloz.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a06bcceb3d27829746613dfa9da0b733/depinurusagit.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d5455a1b1a7c2cc646b72e320ae5cc2a/vejesawezapetulofolasoz.pdf
    • http://falerisztika.hu/tmp/tajavipuj.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5287d039bc---8415144337.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/111f1c8a2f4510f16fc3d7105eed3937/65326335052.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5f806198fcbab7f0147ae9fb8eac8d6/kakurop.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/51491740947.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4b308ec79---powasatenosodoruvuzodered.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_off0000f663.bin
2cc6afcdbf64355e6ff8b5887873e10db538012ad80197901f35bf9e355852d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 5288 bytes
font_01_sfnt_off00010848.bin
5396d20c04af1ba15713e116ac126a5da34d1ba0eaf2d1b431e5e505d15e941e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 10984 bytes

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