Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f64f0b381874de…

MALICIOUS

PDF

53.9 KB Created: 2021-06-14 22:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da80896bfaa7e28710b1515e049077de SHA-1: 27897e827680dd99e5e8dc58cc475dee8d41e75c SHA-256: 15f64f0b381874de900879c5fe9085329d46930c7f46d274984078c07b48fb9b
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 0.6270

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=garry%2527s+mod+free+download+pc+windows+10 PDF link annotation
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/im4gvt4a565v5fvtvup6376ht0/53437286018.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c090d8ae9ae---norobuwupugixamesuputat.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/51bc663bfbe9f4d70c97d1e6e3afc35e/50189090909.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e5cf0eec---pofiluperitixufegigi.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/65290292907.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092640376b7c---romelo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/jawulafuzudokejakunutiba.pdfIn PDF document text
    • https://lasanisports.com/files/61828697492.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/78829160433.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dpe23elcniio588omubl72bfr6/dagubago.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9700356998---69677072609.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa2933267---61860667887.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983808ee21a---bomuxugobos.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/75927875965.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377832e72b---56922962141.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97d4b9690---wanovig.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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