Malicious PDF — malware analysis report

Static analysis result for SHA-256 d766fd0cca380a0e…

MALICIOUS

PDF

79.7 KB Created: 2021-06-13 10:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ed9a6466b3d36e1813d1819ed9bf8a10 SHA-1: 2b1fcca3a7de881956e76b26b4a6ce4302edecda SHA-256: d766fd0cca380a0e37a63fafd661acdcbca333907ba8c69a00f33cca286157e2
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8317

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://laborke.ru/uplcv?utm_term=ms+viswanathan+old+songs PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2bf57ba40fc5c3d636f2951ebb9be4ac/defixusuzonabop.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9a7aeee7d---fawimukuxusanuji.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/s9a9me0e69da0s8494et59e07n/kijupujuxufakefufa.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/18502908639.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a300efe15---29931480036.pdfIn PDF document text
    • http://proxima-design.cz/files/file/35160829000.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/kmqv2j803tfstpu6v8pelki8uo/53275498548.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/csl8uafr7l9a10pv2ndovbe7ui/79233299467.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/95359898535.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/petixelozotixum.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/2642226712.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/3f077ba2ede9cc70d8be80c734d3427a/kowesexebegirolutasel.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/297ba7e351aad4fe23cfc0d704f5854c/16577075678.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbd08d662---wajijudem.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/fasanopulabodozekiwe.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/83855cd3fc6ed9cbab1f1201ae55a79b/jusifasutozugeni.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b135ee8e5c---77627613066.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_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 5148 bytes
SHA-256: e93a8aa17b8b83d3b0ae1fce826fd84f106b851de353beb2093757e548a2a945

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