Malicious PDF — malware analysis report

Static analysis result for SHA-256 3226c3d5507e16aa…

MALICIOUS

PDF

84.9 KB Created: 2021-07-13 22:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9aca6729d5d78a184e6bfee66bbf6dda SHA-1: 7314e6d1098f0c380d2785fe725bc9c7b48baaab SHA-256: 3226c3d5507e16aac847678441387dd54ee0eab8130557772c2bd2d894c624e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The authoring application 'wkhtmltopdf' is often used to generate PDFs from web content, further supporting the idea that this document is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://chcial.ru/uplcv?utm_term=free+photo+editor+app+for+android PDF link annotation
    • https://meganimal.pt/site/upload/file/78586954184.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/487566598051624959514.pdfIn PDF document text
    • https://x-software.cz/data/file/19900060006.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073e730ccda9---41662647462.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zavexu.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/zekek.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/xoxoxikiba.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/joxilifawuso.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/xawusuguka.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/ketajefa.pdfIn PDF document text
    • http://absigorta.com/E/file/luruzofumisur.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/72273696692.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/56340791853.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cee098888117e5bc6da147dec97a0527/160000995.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a15cdfa0c5e---15280012385.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/40afdb3137d6069b29918b4f7a12dd87/11273193613.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/82e788fa62c6aee42121cddc57a6d934/3722415135.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/74377878603.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/flgp00ugruf8vovg41djiqmen3/63467851780.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/27379603330.pdfIn PDF document text
    • http://airsoft1.ro/files/file/77215430744.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2450c391---wadewegugetiloka.pdfIn PDF document text
    • 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_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 16872 bytes
SHA-256: c809bf7ba2b51705f2b4c6055ef72fa22bc19ee17958d6de8b8692f5894a9ba0
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 10360 bytes
SHA-256: c5e76d125cf8ae11d31314cbe06efe7135be472131e76e7fa66333b4ea65bb2b

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