Malicious PDF — malware analysis report

Static analysis result for SHA-256 f191e534f51366ca…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 14:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82c829c6184aa6d12c3e2414802a99e4 SHA-1: 59c5eba834121a829b1aeaca4c026f4a00ed58e6 SHA-256: f191e534f51366cab957c8be095281f7a4a26488cdc6e2a0ff77b79b7ecb3429
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host malicious links. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oykufestivali.com/ckfinder/userfiles/files/71142465165.pdf In PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/kixezulawoguj.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6c3d101d---lepabepamo.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/19287279338.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025630887c---58746575034.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/namoxavejagageko.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/64012344109.pdfIn PDF document text
    • https://epiphanych.com/images/file/zofaginigi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/646a19ef9cf65f3e695364631cb01206/fujonegubepudom.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/hui6c23rm7eij9odssrj8q2hm1/4819177382.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/42036941778.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4difbb66emo9brdtqfuv402n45/20842925648.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fb57637f3---72108605835.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c9fdb346---rigarisepawofixamepop.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/23297707385.pdfIn PDF document text
    • http://asja.ua/userfiles/file/rupifirutolemipub.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a89e38816---21085672028.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a367394e91e---59125277845.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/romoxi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98874c703---numaluxov.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/wulubomakamipemuroji.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fc4b98f9b---pivulemaravobonu.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/mijukivaga.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/45762616482.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/13354123469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=critical+path+method+in+construction+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 11016 bytes
SHA-256: 0f4a341f83c0aec4919b940c7c5832611a469e7c57895f5db98e4217d8bdf758
font_02_sfnt_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 17568 bytes
SHA-256: f3a0298be5b4692743e9ab62635f3a037136453af92d2b9c20321073fd489937

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