Malicious PDF — malware analysis report

Static analysis result for SHA-256 d621352ec277ea71…

MALICIOUS

PDF

71.6 KB Created: 2021-06-24 08:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c41eb7408de14c0630b98c79f1dcaab SHA-1: 702c229d6b68765ad46c50d1f179465c51a5e0b9 SHA-256: d621352ec277ea7161de7a01bd84fcf1e1e56d082a8afb6f4f58b72b50f06f97
154 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 sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7739

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0a772ae6---31889706260.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/fb783cf5906d7d91fabc2161813d8ce1/6863842980.pdf
    • http://stressmanagement-karriere.de/userfiles/file/31543998968.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/de178d47da56e59cec74383ad9125708/mowozalunegiwejowunugenu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e632079def---10023723195.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094b798c1d9f---boxuratanosupepefida.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/5fl5c3hc8jl4rrsoip8ug6v734/43842013914.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b9ea9b176---47965112169.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c494e838bd---73483638580.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kugudopisijiladarunezuj.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608980ab99a77---6974959929.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609df42ee56e7---famiwaxedulapozevig.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c584a72eb5---222256276.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3443702d8f57c58c5151ad040500cd02/rulegadijinizidubelav.pdf
    • https://khabul.mn/mmpa/userfiles/files/lulezugazogenofakatiruga.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac7d89d7b---jukarejalerodukivareb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nasal+decongestant+pharmacology+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0af.bin
32dc72c42e14884e5d284cb6159d96c9e5dc11f6aac740b5db6c488c579121de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 5380 bytes
font_01_sfnt_off0000f2cd.bin
2025348e0a0c7363137bf249181440b238abeae35679e6b9b7fc5d6b924911db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 10980 bytes

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