Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90f657a0211a158…

MALICIOUS

PDF

109.5 KB Created: 2021-07-18 23:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e4a38ee412b46ece48bcdc6617d47d4 SHA-1: 35726602f40a29bf744e2a2a7430c23bbaa92486 SHA-256: c90f657a0211a15897a3f3318f39762e027ed9596617c1da2259b0cb68a1958a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous compromised WordPress upload directories and disposable hosting sites. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/71f6irfs8i0psh61usg3f3q0jh/3880505194.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac7da993f---xesod.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b1ec5919a---53957918220.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf7890c13---dufewopek.pdfIn PDF document text
    • http://tipiland.net/upload/file/nawijez.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/91360321109.pdfIn PDF document text
    • https://nada70.org/userfiles/file/13309637622.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/35d26bf384482e6b45de44390d97d047/sobenerarufujaletijude.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb12e6dcf---29951328702.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/bivugolezirepubutilewe.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/jikidex.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3e12775a47cbf66cd472f7aaeb4cfc0e/sonumodozifavadaligom.pdfIn PDF document text
    • https://melz-feu.ru/upload/tegafe.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vilikemepigosarixotetitet.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/fokejikisu.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5bbb63921bfe8caa4eadb6bf4e13c811/16149111073.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5c85f1d140cc089dbbccbfd842662e6d/lerubisodibu.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/rakibotumowobos.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/62538201303.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edfb8266b26---73675084097.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8586219741f444075656bc07a6b9ae03/dezaba.pdfIn PDF document text
    • http://schokozentrale.de/idata/95371768855.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/68a1c75f5e4fdf7bcf6c28bd05806ea9/gunozapemijowexoveliduru.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160762932beea8---38225924474.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/boxebexurexoxapomazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dilwale+full+movie+freePDF 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_off00014511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14511 20496 bytes
SHA-256: 69b60c8134f7f67c17f3c439970012800d421dba1d4e080a1dab6a3a5743bef8
font_01_sfnt_off00017967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001917e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1917E 10260 bytes
SHA-256: 4008b9664be4c2371856c5bfa2289c869d50c6c088d1460b7633acec987959ad

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