Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2cdcb56775d91f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 17:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: be990ede7b8e0aa84209be30a7c91745 SHA-1: c8e18fb17ad89fb76e955182f085f763b77edb68 SHA-256: 6a2cdcb56775d91f6118a9ff0b0f4a83f570cf66e79aa5d65fb5b22c7d0e01b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9974

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=vivaldi+concerto+in+a+minor+violin+pdf PDF link annotation
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c332c56c7---vonebirotozemewigato.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/73849611628.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/delobuwamimijuluvujegi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1jsdqvmi39drjfcpkdc2dq4k43/11826871707.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d9d8c1fb---banurefebuduvipit.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/runexagekojitavepekiv.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/20088436723.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/62346991326.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b78c9853---6645773293.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/10961612766.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/radumixulegimawagojubad.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/mubodujexi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc13b5c8ef1---jeverorajatuduto.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/4f1290fd64a4d10c7989af4d9f6bb0f7/pipitaxadaxunasukumonef.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/sogoku.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/nepuwaputigiwuji.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd16e661dd---17667634828.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/crl9itt4cqbe7h1jbenaaucl0q/sokubulogosiwe.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/kegenasovesudevusubevag.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608091507c2b0---94528246222.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/etine.pdfIn PDF document text
    • https://kopari.hu/files/file/bupupizemoxosavuvirasos.pdfIn PDF document text
    • https://mattress-leader.com/media/riregowinapi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda538f421---11433891360.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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 18240 bytes
SHA-256: 1b4f01c375e65228a39ecc612866d3c8bc6e86099460b0fed1d1889aa4f76f2e
font_01_sfnt_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 10648 bytes
SHA-256: edfca08e2a5551e992793f9331afce6f356c3856eeb0df30bd099db21d2c071d
font_02_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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