Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c91bf36e1cdb39…

MALICIOUS

PDF

51.6 KB Created: 2021-06-07 19:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 552e5f6a444e9df3a40e75960ca89873 SHA-1: 589fd5b02154e74097f2f3ad1da84a8dc478d2e6 SHA-256: 63c91bf36e1cdb3907960e2346252407c023b2791974f2d63743e1ea8f4efbf0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7384

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://queure.ru/uplcv?utm_term=lunchtime+results+2019+history PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087326899b4b---45390062911.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/parikimarerekafexizureso.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160970daab9019---gimaduwiluzejeda.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/69017040711.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/62536624006.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c9009d62---rusowitigidaxedarixowiril.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/613695256ec6551e7b55a9e4b43bd7b8/pevanunugukurozowelaxabom.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lkrbh6igme1ono66lvseh6au6/zirepijunud.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050410446723.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4258ee299---8631663710.pdfIn PDF document text
    • https://bem-sa.com/img/file/nukukajepekik.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rtiocgihdvqkrnpulmstmrdnu3/68706813594.pdfIn PDF document text
    • https://actorconseil.com/files/file/71802286153.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84f3dc927---60477605550.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5c8360ced---27421069942.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1dedae958---86237838379.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6c010b87c9b54bfdcca238897f3d063f/44865657888.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079002b5f123---62162834318.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/ketokululapet.pdfIn PDF document text

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