Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e498251f462ad16…

MALICIOUS

PDF

63.6 KB Created: 2021-06-21 07:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4ca3afc59acdbb85b66e170539d97850 SHA-1: 24eaedde9fbe8b429133af598e416ee76f6cf8d6 SHA-256: 5e498251f462ad166961adf0a360e8946eba0dc1244d7785ecc76b50e4f131e5
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's part of a phishing or scam campaign. The embedded URLs likely lead to the download of a second-stage payload, potentially exploiting vulnerabilities or tricking the user into executing it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8630

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://synerhu.ru/uplcv?utm_term=gg+game+hacker+pubg PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/550d2c3c51e7f4a85a9cd28b9aeb3f4e/wuviwekesanafirafujes.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f6e46a801---denimepojuvalusajeruvex.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c557412e---92127648459.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3fa0bf4c3---76247993637.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/708b6rpfj5r0t11p0ai1278ndf/6094546193.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/newuvowosamu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/96c3db968d3942b1543a8c9b4f313ea8/67343565332.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rebima.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/49581609382.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/bobele.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vevidibuteranolerigike.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad53c2cdb7---jalutulopafejufudisijuke.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca04538409---bonana.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1b1c259049e3aebde5ca5796104c6a3b/vebomevulifuvuxirupumixaj.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c519d16899b---97874189995.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66f75c3c8---judumidatesewilipo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/xanap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 5372 bytes
SHA-256: 2b5198df11b43e5918bce86a8977ff6044c96de62c4ad68c6326776c90d02939

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