Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3390bdab7e6c740…

MALICIOUS

PDF

67.9 KB Created: 2021-06-14 11:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ab8a670a69ef5dd5b99132cecc9aa893 SHA-1: 2ffdf41e7c4d6640cb0d043dd0e3249faf3a85dd SHA-256: e3390bdab7e6c740bfbd44c40e21195f116c2ca13dd381924589315e158666e4
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8149

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://wastran.ru/uplcv?utm_term=basic+security+testing+with+kali+linux+free+pdf PDF link annotation
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/u10tnf3h2umh857cv59np3h1lt/zufirexijimiluvutamugo.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/4c4a7f612d1ef2208b1f0df937eec8e8/33024221547.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d56850d3---sijovujevokimajupasugim.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc6c73c463---33675357014.pdfIn PDF document text
    • http://kfbi.ru/content/file/rozixowum.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/gemivil.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6ru6j6lcnp54djkaefiqsh05c7/3269940727.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/luwazimisixofowev.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1ecgkvt20tj8nmv71tl2j3p2o5/rosozapokifepug.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074430759cce---lojutamirogusina.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e7d77c93b37cdcd466c213f3c56b3a99/lexutot.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6761_20210515044809.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909404acd88---seropakiniregusibu.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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 5792 bytes
SHA-256: 50b17a9c350fc72dee56f2629c46093e8bd3cb796131de5327e17a7e2d5a57ce

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