Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a63f87b237a8c54…

MALICIOUS

PDF

48.0 KB Created: 2021-09-18 17:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8475ac6f89c2c1e9cc2d9df0e73fdcac SHA-1: 9b026ed250363cfed298c6a1de9ce83406882026 SHA-256: 6a63f87b237a8c546c84c2372380e79a5e74f8963678cf81cd66d3ee34e2cad1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the link farm structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7448

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=pregnancy+book+in+gujarati+pdf PDF link annotation
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8fqmc5bn8ff50q2bmo3m9otb01/rasufesonojokomunaxaj.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910012733.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/38690911904.pdfIn PDF document text
    • https://schmitz.cz/res/file/37342929882.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/milujifakeko.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee8f27ae2---52500381472.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/xovigizazotetoniza.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/89349360701.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/47401117597.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/92881474052.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/posozabenujo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b9c8c8a9---jabiferodovovoke.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/vupigu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161363bc5641ca---posavojufujutajafuweki.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/romakovu.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/maluk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a75291e39---mekigimekelopi.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210908_7A05B45322F48539.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/96003446559.pdfIn PDF document text
    • https://electroagro.es/pub/files/koxuxazesegubur.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136c571246e4---9736304441.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/62588885697.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/nurelopenukivomotolux.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/84509727307.pdfIn PDF document text

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