Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f666ab6223f116…

MALICIOUS

PDF

63.7 KB Created: 2021-06-08 00:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 18f4b5cc336fdd79512ed042d5508ba0 SHA-1: 08e5f2b28829017825ed0380dc1f8cb2ac8aeaf6 SHA-256: f7f666ab6223f1169c257daf95c458a1ecf949878644a297046ff56c6d5e7584
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8357

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 https://crewmak.ru/uplcv?utm_term=recetas+de+cervezas+artesanales+pdf PDF link annotation
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081858fdbd19---93820803680.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/timoninak.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/31341427683.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f69dd3b40---nexupegike.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/lijepole.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/35jh5hfjfaoeffo0dqbf5c4tgt/40007644268.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/jiwuvuvub.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/93qobe1csg9aklsgfk7dnmj7ff/83743043939.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/xetinuzamusevos.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/22075679111.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d2f3e76b1af032de5dd45405bbdcc517/kewatilerimudilosexobulug.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6c638f651---47048022419.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4da7a4ebd28db35c38a0a4e7b8fdcf07/33916731413.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/482007a3caf3c4d6dea686bf802d5033/3980816446.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/69939778743.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/798430f57ead8a9b32a55dc409ad7054/jolas.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_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 5268 bytes
SHA-256: a4681e450f3eefa7ddf2076939f6daa6455d73b7ed6795905e81a7e6a3f3824b

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