Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bccb8d3cc36bc60…

MALICIOUS

PDF

62.5 KB Created: 2021-05-29 12:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bacfb13765e3528936f0d12cdbd2b401 SHA-1: 75ceab5d3f755757d648da746a5211e76230478f SHA-256: 2bccb8d3cc36bc6013235e17247a4c39f9d603797ebd876ded9b43904fc73b0f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body text is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://abogadosaguilar.com/ckfinder/userfiles/files/7502417866.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/aa64a2638af207c6a5a33ff2793127b4/vebofoki.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i488aci3robcf6ikmmgld3qrnc/vulux.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094369fcdb98---pagerufesixofoseneninelu.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ml4cg3952n2e7n659u2jaj1ki7/26448376825.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5c437fbf44c718b6bc3fcecbfe2f27aa/xisowutefedupu.pdf
    • http://www.cddfct.com/up_files/file/gojukamo.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608feab1103bd---robipela.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a2828a994bc---xiworodizitekopi.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dfcd0a01---23613429010.pdf
    • http://agendatourvietnam.com/hinhanh/file/fobitobogivojikasulesex.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4a500755914b3804ccbd8a876613891c/76775007524.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076500f04dbb---visimopixunuvunek.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836698f30d7---33955147315.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3122e4d58---rovupovukegagokezedexiku.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e56c82f0---sedaxajutobiruwawofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=trading+company+profile+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7bd.bin
bfe2032ccbc713fc0c125236229ac70b9b8321b99827e84885ae46e8edd01776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 5348 bytes

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