Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfe6dbf119942c6…

MALICIOUS

PDF

77.5 KB Created: 2021-07-29 11:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b91f4bd3096c018128e93a10883b3ce8 SHA-1: 84a663e7565f3f50380718bd844ccfe832d27abf SHA-256: cdfe6dbf119942c6cc485fa75f919bebcf50481c233012d41ef93b6386b0f97a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, potentially to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8658

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 https://infrive.ru/uplcv?utm_term=html+exercises+for+students+pdf PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/27a9a43365628cf8aed9e88d1dd25e15/zizelaguxirujujurasajofov.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/86934741764.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/nebelinidegimukebusemon.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/1717805330.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0a367d0f31b9efd6669af64cca3aa1e5/tivuz.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9880ea269---40244898622.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/36119206276.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/17367550833.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9dc2a2bea---besumiwafaku.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jisawidotesaxewazud.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/69503986003.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/48983424603.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd09646e240---vejovim.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8bqev4pkn9dut08afn74q866jo/vawipulisutoku.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608897060d853---73405225881.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160f81610581aa---7645645168.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a0d4ce7ca---22355703855.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759b82180f5---fidobevumujevefuzew.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021615413317697.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/99151524300.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ic9jp69oc6q4kkqqh900ohjcl0/budumelumaruvewagesob.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/opfc3f7msjhart7hlbfb8mm054/guwuj.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c13b45005---90509693045.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160719e4a55cbd---78349282026.pdfIn PDF document text
    • 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_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 17664 bytes
SHA-256: ce5b09af1d62c9067dabe720b3b74dd154581dde052e07d85572bb167fec918b