Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3347f3c0a86af3…

MALICIOUS

PDF

105.6 KB Created: 2021-06-28 01:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9df663968096053d4d439fa823f0cefb SHA-1: 1fbcf7d6bb3d86445a7e9bfcb3c27f97b19e6ac6 SHA-256: cb3347f3c0a86af3dfc64732f671e1bee203a914deefb6789a871cc51c38a214
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of link farms on disposable hosting and compromised CMS uploads further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://medvor.ru/uplcv?utm_term=how+to+disappear+completely+and+never+be+found+doug+richmond PDF link annotation
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1frultsb99d554m0lpnajd69n8/89495011310.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/43054359527.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/nobizotojipifop.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/mbcd6kpk4653i6hgv974aelva4/vojomijazoxofodemumuvit.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609af283d8876---3946726162.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ikiv4lgkp13kuokvavbvpfcaou/67259202403.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e6c6dacf404a586055e1f478c2415cac/karadikirurubofuvulobog.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gexopovatawa.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/mijuvemutofiravetozas.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/soguzezedavitekaraba.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/22616591051.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/33432304773.pdfIn PDF document text
    • https://renetravel.ro/images/files/guwugufebi.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/xefujezi.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/69554044111.pdfIn PDF document text
    • https://mmszke.hu/files/file/4936243330.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a296b41d446---31714722170.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/60946350701.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/nsaucflkm6n6e9opasj3s3itp0/zejemug.pdfIn PDF document text
    • http://vodnik48.ru/content/file/mukalukubevubusurave.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607624b114377---24459626210.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746e9e390b---30659300945.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kuwakuwafuw.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/438beb5d6646e7b0afcfc014907b3943/forudokafoxinadame.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_off00013431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13431 11564 bytes
SHA-256: 45010b954f3523925843c3de377a1815c5db1f94e9023f5f0925dd049dba1634
font_01_sfnt_off00014f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F13 18680 bytes
SHA-256: 6c27508258ed36cf0fb2b69cad62210fc74c87bd27fbd9b784ba9cfdc514ac35
font_02_sfnt_off00018040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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