Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bd11565f80662b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 22:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f461cc23ad3e28bf964ba4289094dee SHA-1: 3a23d73d65f2c7c118bbf4b4b7bfd3bdd0d20a60 SHA-256: 40bd11565f80662bceb9703810c50bac121d3e4c71e24ea6b70f4b1195a10400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to lead the user to malicious external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pixomot.ru/uplcv?utm_term=pytorch+deep+learning+pdf
    • https://volandovia.it/public/fileeditor/file/98805968447.pdf
    • https://mehreganimaging.ir/images/upload/files/95685445092.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e40fa543d6---50140508372.pdf
    • http://kapalishakti.com/ckfinder/userfiles/files/72100821476.pdf
    • http://learnersdigest.org/userfiles/file/defexibixusozipazejubi.pdf
    • http://goldcoil.com/uploadfiles/files/11495612034.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/kevegatazibepegupatofir.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ee2b5cc---434197963.pdf
    • http://tgtech-auto.com/userfiles/file/miwekegijuxeve.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee9417d32---97678411930.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1nv8l85h5c2pa7m097rps8ddda/busegesawixupedilekalav.pdf
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/75685657881.pdf
    • http://thephinhmienbac.com/upload/files/darefowiw.pdf
    • https://e-room.co/userfiles/file/ziweju.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/99847838969.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f56c47bcf5---fogujewuzugowubidis.pdf
    • http://stapper.de/sites/default/files/userfilesfile/sezevifomokafuda.pdf
    • http://stauarchitetti.eu/userfiles/files/gumoxabuvatumugumew.pdf
    • https://designclarf.it/file/xasedidos.pdf
    • http://thechelseaff.com/user_uploads/files/faxifokuduxoxanaf.pdf
    • https://estatecambodia.com/htdocs/cljr/data/files/gamavul.pdf
    • http://tochuchoinghi.org/files/79624823171.pdf
    • http://forti.in/userfiles/file/92365544051.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210904_88C4E02125626E35.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 16792 bytes
font_01_sfnt_off0000f70b.bin
5a305e7e15ff4d2a15c52a7631b43e2585e67164ee8d51c61ba6f42476457c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 10848 bytes
font_02_sfnt_off00010fd1.bin
84a5ce334a3c838bce6bc080a41ba3d79264d6decab5f7b1c0472ff312b71b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 19420 bytes