Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c3d2d824ae2e8b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 23:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 05d670cecda99d90230a2389d8e2873a SHA-1: 8e5a6a6008699ee206dee389041033a3b0135a29 SHA-256: 22c3d2d824ae2e8b024aa74e54de9c24c4058752edb21f1de0097d63d2613a2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/93206118098.pdf In PDF document text
    • http://choragwica.pl/userfiles/file/pijoliwefonu.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784fab036a0---vajeboxuximow.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/xixezejabagu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/latidojoxapuv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c4e7b85d---ponawaxatolasexi.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/jitijutefepiji.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/78os4207f8u25g3us27affubh0/96646394973.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/mopinuvuweseloranororoda.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/89992913532.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec78978486---kabonafega.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/koxamaxefa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa568b66cab---68784018861.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/cc716021fb6f8c7f2d6fbe79aa5e8b42/34189081957.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/zexozuvamekisitutiwev.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609110223c77e---dofajeraxik.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/kupifirego.pdfIn PDF document text
    • http://prosquash.by/data/49218204336.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/xaxifesog.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a678855ae8---14629183743.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/725bd48446359594c4c0942c1c4b099d/69829851618.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16232825768116.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfd10b091---meberesodemajage.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/rk289h7rnrv71cns7evth89c7q/kodasimiladipenumu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/jovojakikibuzanel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=barreno+ahoyador+manualPDF 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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 10424 bytes
SHA-256: 1372032288518ebc0fb28e965b1595103ef63bc07a7e56456ced8fecc3c25d60
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 19892 bytes
SHA-256: bf6a66439f66571eab5e9a735e48e1b387887eee56fea40843264e1f7cf7fcec
font_02_sfnt_off00013494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1