Malicious PDF — malware analysis report

Static analysis result for SHA-256 825fd6c351fd509e…

MALICIOUS

PDF

81.9 KB Created: 2021-07-06 20:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 43401d521c8fa0d84614f3b656b247ee SHA-1: b9188dcb2dfeb4c75b2ac80077b4f4d8ca9baaf5 SHA-256: 825fd6c351fd509ef28c00a22bb8b60efc2430bc1e9f0aa7a4cd4c52a12f9995
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 hosting PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7f31b2f07---kazajewegojefemegaza.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/12f0fcb539997f8917af6a0fb8527e9e/35216130174.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/c35a5865fe36296a202b7fa111da4923/xureruzufarixalojokez.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gg8ji7al8uh9chkg9vig0r9j2g/gotenalu.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/xovevisir.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17702f2d0---jetelivujuxoxitolamo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/52582907890.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/d45016a4ff28fbd4dd99f702e13ede8d/biwitexefunuvulijupalukik.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/82786101424.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbfd70cc0f31b0e20b3cc52e067770cc/nenazilevide.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8291edd8---40676834088.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/bewagem.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa25a2929---61364279335.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abf095ace1b---xozadigesopezabozupile.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/numajoponewinunuvijaleluk.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/21972861575.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3lb55tr72o4gigl4m1c7nslrkp/pewitasipakojawuwenir.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c6047a4dc---gotadabefewalujudevawegi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/27982382762.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7b824072---sesitulol.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f72568d8f---85397561574.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pmnvakt26jbfo7t9c4gn7bl5d3/12335192835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=countable+and+uncountable+listening+exercisesPDF 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_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 18200 bytes
SHA-256: d7eb6d73c67da99e22338827dbb2c0907f53152322c14bdf44811a48082afcf4
font_02_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 10920 bytes
SHA-256: fc6a166bb9b3b749736d3f13238af05ca0cc520e69b4354bc41ec3ca9bdea729

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