Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e0e4e130bfc2f9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 08:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb218fbdd024751f4c514434ce69ef02 SHA-1: 2a01e9e713d6e38ed6066e8d3eec087400b8aec0 SHA-256: b8e0e4e130bfc2f961cbdea73a3a36ab9fc3cf6c834b4df518db6a7258971a95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and link farm structure indicate an attempt to lure users into downloading or accessing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://zjleiou.com/images/upload/File/33317244373.pdf In PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/lmis6kqkns0eujt1m7q98ujpii/jolupuworakofogilixir.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/gowigasew.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/nilamaz.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/karijuxexiburiwe.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/39857067866.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ae27397f1---renafas.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/ronugunej.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fb121ddea0af568f2b71ce6d02048526/vumomaliwufakiwilabos.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/90558590564.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8f50df92---napozewubewovimazunokug.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///bibafip.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/46360056737.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/55303797967.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zajidaxenoxuv.pdfIn PDF document text
    • http://parfumland.sk/upl/rudujebuniwavofarudif.pdfIn PDF document text
    • http://eternaseguros.net/files/files/1298431109.pdfIn PDF document text
    • https://korankertas.com/contents/files/9565313195.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/vodametejuwumosozetoza.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/69592517974.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/57137026734.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/95679076582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tubemate+2.2+9+download+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 10896 bytes
SHA-256: 5229996d4a5c2e8b5fe350e19a3859ab578267a3bed0173dffd6e3eacaaa9f9e
font_01_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 19052 bytes
SHA-256: 562213f24b00bf43a9960b264744d966dc4e7d7a6bc54b4959f67e4bca2b2900
font_02_sfnt_off00012aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1