Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaf2415e54e2e62…

MALICIOUS

PDF

70.8 KB Created: 2021-06-22 21:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a66e28d23888270a3c39a0ad4fa1e597 SHA-1: 17495fb65177590109af28db806a693f25310b4b SHA-256: 6eaf2415e54e2e62c59cb5f9c0bab1f8d00b6685b35c9246e1dd7d2d60e9d4cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated and truncated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://birzebbugastpetersfc.com/files/file/70063857864.pdf
    • https://amursvoidom.ru/media/files/burituja.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/57429615213.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8945e5353e9fe0f665c9c56aeca1147e/mojuzuzosutarumijegaz.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pvmf79n6f39eoh91n0bfqti2v6/60432683157.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbda3a7f53---zudesiporiforalovimulatod.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3921370b705f771b8c7f60da93fe7707/xulidev.pdf
    • http://gramercygrand.ru/files/file/wekaluwapirufukedigiwokex.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/21950292317.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/6eff7b22d3f741835574514134069f0e/fowejenubanetobatob.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3s5o42prl1c36j5jm2ngtllsu0/73414765579.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ls33j6afdklsuhnnkeer9r406/4356141382.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/08d0ea61622b699c98ce2ad63abfa756/39365001489.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/matoxeriveriwabelig.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1a0c43b1---lumeziw.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbtgo3gjmmuuq0nu6kg1e2pgjo/41812519904.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=kannala+mayakuriye+sema+kattaya+song
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c294.bin
59d5a0786453770cb69227cb6f01a7c7b4053d2174b09c118a6c2dd1f3b97ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC294 5140 bytes
font_01_sfnt_off0000d409.bin
9117a1322411fad0af24dfbc85960811a43bd53912bac97b81563d848d2aa419		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD409 10532 bytes
font_02_sfnt_off0000f84f.bin
cb8b0c3b75634a3ac40028f3142d2b99dbff9c8bfe93654f62892c2eba89f065		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 16336 bytes

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