Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef0dc89fcb133d1…

MALICIOUS

PDF

97.2 KB Created: 2021-07-30 05:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba7e457ca4b593d34af88ae0f2f1e3d3 SHA-1: a11cadead3d8f182a78c082aea4518648495e52b SHA-256: 3ef0dc89fcb133d1f20204c5af4ac1f5d86926520a3bb42af87ba31addf8d076
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO manipulation or tracking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=what+is+the+expanded+accounting+equation+formula
    • http://mini-garden.ru/userfiles/file/revelekegamube.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/85317d15cb03d1ada5c1e278d8d4275a/85885906196.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1f709259---55045942011.pdf
    • http://artecgroupservices.com/imagenes/file/30638465555.pdf
    • https://www.tunnel.de/files/uploaded/file/fidomedatavin.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ec10f11c---nefisuwi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc779a2dc2e---98436796916.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c615031b923---sarabirubapebirop.pdf
    • https://its-bulgaria.bg/files/file/kuwewafonixur.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1ch1gthautpo7oid2tc39790s4/28376795145.pdf
    • http://highendschmiede.de/highendfiles/file/mimapemana.pdf
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/92289951190.pdf
    • https://promobryansk.ru/userfiles/files/88164244167.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/maremibur.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39981662453.pdf
    • http://sarljarry.fr/userfiles/file/mojefupusukober.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e0a70f4c4cbd4e75b43e50e150435e0a/57173097601.pdf
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/xitenefex.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ob07ma3ss9u73ar6qvt10o09cf/20857801788.pdf
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/luxelunakifiwirumekon.pdf
    • https://pt2-turbo-j3t.com/contents//files/zebapi.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/921fatjm2jflhl2vqj2v9q7706/xoramotuzajugakigojol.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aaba9620605514e18e93646482761347/10775731326.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/sulesudemamudaxorimi.pdf
    • 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://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_off000114ad.bin
3af9363b0773e7af71d0c43285de1f006dbd6f61f0d9eccaab01070f66365002
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 17504 bytes
font_01_sfnt_off000142f9.bin
5a3c280022a3d0c69625210902564513a811cc0a836e1794edbfd6e5df92b9d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x142F9 11408 bytes
font_02_sfnt_off00015d3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3B 16792 bytes