Malicious PDF — malware analysis report

Static analysis result for SHA-256 373d3ab1944aadcb…

MALICIOUS

PDF

58.4 KB Created: 2021-09-04 10:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92d01df628183a6c5f7f42d0319bc22d SHA-1: 5f014eb55bdd03cdedc240d1a7a0a8b90ca405f4 SHA-256: 373d3ab1944aadcbc17b761326342aac2ed739cd8a7f73d2d12c4db8a7d50272
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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://goteneplast.se/files/images/file/70485451209.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609191f5ede65---kutebuvaruxawuxujo.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/wojizesuvapidezutigu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/44143792120.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f81b36c479fb0b0859344aba56c9ae79/nimulidimowurujodirelez.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/14536857994.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jijiliboripima.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/jebebozolozixizubadilu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/difunosudipemavisaden.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/97881993570.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/s85qj2nc5f701m95jgm2k8aka8/jaloruvi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/75525462d8945fe10b8e11778923301c/negivixutonitem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9b6ee705---84661229627.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f2178d74---1641115272.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/tesuwakuleni.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b1e5f34070db783718b346f932f23683/2477552490.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc1a2895a8---nibutipirunitugewepox.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/danezudixodiwul.pdfIn PDF document text
    • https://chp-travel.ir/data/file/wafitakudunuxebewo.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/duneratezi.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/redetubazizipepi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f6cd962146f26dc32ad2328a2bc258d0/41455797107.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/tojoxozazonaxivawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=customary+units+of+measure+worksheets+6th+gradePDF link annotation

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