Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4d3a88ff75b98f…

MALICIOUS

PDF

60.9 KB Created: 2021-09-13 06:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e20839ce148b771502b6e884b94a2a8 SHA-1: d3f9718fd7571b5402b1036ba2c3b88632823aee SHA-256: 9b4d3a88ff75b98fb6bfb18da7805c74e95cb08f44135af18caf5ad621fadc02
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters in some URLs suggests SEO manipulation to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7577

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://krisoc.ru/uplcv?utm_term=free+sex+game+apk+download PDF link annotation
    • http://adas-muko.pl/photo/file/fedonolesesixudo.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/puvideragutosazag.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nofexotiga.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090811491273499.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/jewuditejitesodasiruw.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/xubebuto.pdfIn PDF document text
    • https://tuinvandecruys.be/file/fobozutodesowirimuvog.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/jogum.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/nuzorafowamixedit.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139107437bfe---fopiresowawejolisu.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/9876575317.pdfIn PDF document text
    • http://knauto.com/upload/file///borolikeporinutuge.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d73b74de7deba2a3a391d4ae4cf826d9/rolumidorodut.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b32073140b---86015790318.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/59693594589.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/35878553574.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/7310412012.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/65754239781.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/wovafobos.pdfIn PDF document text
    • https://medtek.vn/storage/file/34950539011.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382616e83f0---95771812167.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 18232 bytes
SHA-256: 64c20611b1895eeefa4bf1cc61b6613b1727fb0edbd4871aae6fc6436154c54c

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