Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c15fb88775815d4…

MALICIOUS

PDF

72.2 KB Created: 2021-06-11 10:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3fd3049c8b9ae9fceeac18e16c12fbc2 SHA-1: bdc841d1829953a7f4fdb4a8d36688c75a1a822a SHA-256: 4c15fb88775815d444d6a26838ecddc1ab0837766e673e1d1235aa8955820715
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it is part of a phishing or malware distribution campaign. The embedded URLs and link farm heuristics point towards an attempt to redirect users to malicious content, likely for downloading unwanted software or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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://cructi.ru/uplcv?utm_term=gta+5+for+mobile+download+apk PDF link annotation
    • http://simonhoirup.dk/userfiles/file/dolevaso.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985a5e13a04---68809620765.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/68262832279.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2fbd55fd0bb0d7752675e2437c19f15f/21218254169.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9cf93c41d6f80849281dc5e4e08d60ab/dobubajewutomenujefufasil.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/34799004909.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/gfpes8n65qgpgb05tvpacr702t/34576637498.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c105ebafb5480cd8bff44afa8e792fbd/jepemavetixanexujimaz.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd17c75e38---51619858150.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k4ct1pvc66ors94gsu3bgvjv67/zuxuxibemopajogojad.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c889422a445a9163bd6d6b74a29b869b/timexojukugatuwegadaxen.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088252bb4fa5---kidavosawopowikakevopiruj.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160be11eec1213---lozixikafujiwibukif.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d836e42a0f---puzidew.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/64gckh6etkfke5httdnadoib4u/dijexuruvejavukabo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 5460 bytes
SHA-256: 261b5d404ed601d887fd4b06d49cf09e41231d32108b44ac602934973a44b9b3

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