Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80843a631e8af0b…

MALICIOUS

PDF

52.1 KB Created: 2021-08-27 14:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c2bcfe778523b289d0101de173a8a29a SHA-1: 58f68c81f3850c10185c97ec32c6722146bdf406 SHA-256: b80843a631e8af0b56e773fb1e64d38fdd202f448c6101a91e1082f98ba222a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristic firings suggest this file acts as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7818

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 http://www.ks-klinika.ru/ckfinder/userfiles/files/56605674734.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/2dj0ejhmful7nee7uh09ijb7s3/kunivalemoxi.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/tafiruvelafunisorelo.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/6ov4mdnptigpql4o5umr715fe0/duzukamilegozedolubal.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/vajiromepugenotite.pdfIn PDF document text
    • http://unsersohn.ch/images/file/95974131759.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc813e7762---91506018188.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/52575569145.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ddf106f94---78977789631.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/acc0b51aa6b4292aa6ce75b3513f27a0/90090943743.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/901edbd4708bd239dbde6ac612319d5e/82630083717.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16de86c1f---25986533896.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4035267826.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1a143cd4b4c0e97db253602d3e1984bc/73562884193.pdfIn PDF document text
    • http://blatt-gruen.ch/files/18645152760.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/23180157956.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bee49c6a0ab---50106177778.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/mizeburokelidemudabaj.pdfIn PDF document text
    • http://piecco.eu/upload/files/kinunajuduvo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93b10404d---xozibilogerawug.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/27083019702.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/ziwedinepexaxizido.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/wetufepemuzuwibosononufi.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/23958614123.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejutomikuletiw.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160adab3877a31---74837401372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=lcm+of+5+3+2PDF link annotation

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