Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46ee29b8e8cdd3a…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 09:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 014a2ea5a8d159973c2b379304a28b2a SHA-1: 9fb97778682bd362b2a545daf31695aa3cd98057 SHA-256: b46ee29b8e8cdd3a062eef8b9607751fad1ab822f07df41cfe343c09b5cdfc2f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7924

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 http://hurtowniagrafit.pl/userfiles/file/24930438683.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/wuwoz.pdfIn PDF document text
    • https://ntc-container.com/upload/files/zogewerak.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/xobuvewamajazawi.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xopiluvovugirejuzef.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/32317231298.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021910322406087.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/65113207725.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/vunawolevemoxowezirewum.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613639c624349---koligidojaboj.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e167d065aa6cc4458bcb1c8bdd037e3b/wibenadomebigosepof.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/fatibivuvebabimeten.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/6660183729.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/50585304267.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/digojugavojimenelej.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/wefamutonujonuretov.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161349703eb594---xepapusokonam.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/jinuxugisafuxurilewazufe.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/49396999601.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18c9863ea---9843775160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=multiling+keyboard+apkPDF link annotation
    • 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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 20044 bytes
SHA-256: 96b6452a286fbb02c613bb2f93f8e4a8c55282d7623a828b1c23df52efad79a1

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