Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb2cdd338c15586…

MALICIOUS

PDF

63.6 KB Created: 2021-09-23 00:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 50aa2b00c09f7a4f88c7c262918b5c7c SHA-1: 6227dc30962182dc377820e21b9e0da04cb8aa21 SHA-256: 4eb2cdd338c155860f2c0a5520ca21936ac6ffa628c3f1d2386530c2635eab27
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to various domains, some of which appear to be compromised or disposable hosting. The presence of these links suggests the primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://halkum.rs/files/kedago.pdf In PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/58873178659.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/43310264998.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/ruvalonavevod.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xirilusawifafubenugupa.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/53738258236.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mozizajojimed.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/52433784783.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/bilexosigez.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ecb26a73---xoriganiwununifovafidega.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/tikudanetulivixajugasebav.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/19084294110.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134152d31187---lefakeganodokuk.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/20657437144.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t15cb3ce989vphv6meu6cj2ul5/9693449082.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/bigifoxidofuvonuzamiwe.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/68282261115.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210918_B96EEF283F96A4A8.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614654e75a7f0---49904445403.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/71564386458.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/lusijisi.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/ziwanatavegewomodarugu.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908081748.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/42777489508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=chou+thunderfist+skin+injectorPDF link annotation
    • 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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 10716 bytes
SHA-256: 789d32bebd13d426a5327acc5565faa1caf772bc0343b915f0201cc314d86801

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