Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cf6a6f5736c64f…

MALICIOUS

PDF

118.5 KB Created: 2021-07-05 07:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 480559115960b8165a2bcc5ccff45bce SHA-1: 2e0cada02d3aa00dbb44b13a7892e743cc75daf8 SHA-256: c3cf6a6f5736c64f89cb578f86974513849b93f70551820c73104b13c871822c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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://archism.ru/uplcv?utm_term=closed+anterior+fontanelle
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/a712994495d14c8a701514eb6b720fb9/sopugipefopi.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a5baf44b---gexopuvikalone.pdf
    • http://criminisiepartners.it/userfiles/files/kotezepozegujiwejenivu.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16078efc9911f4---mebevuxewezavibolituda.pdf
    • http://files.ibiza-ferien.de/file/pimivateboxupud.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607797c8a1f9b---85047000371.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa901d47678---domebafogobedaremugi.pdf
    • https://bdaudit.ro/userfiles/file/13776888827.pdf
    • http://naszymsladem.pl/upload/file/zurujexebuwufonuwigig.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6dd7aa968---3454351141.pdf
    • https://digireg.se/upload/83539935930.pdf
    • http://hurtmar.pl/Upload/file/99729112651.pdf
    • http://arisutour.com/ckupload/files/73288707927.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/56d70c27b95d23f228982bf0b83d1fcc/pakunebobezozojutor.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b95676fc---diberofobobox.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5e7145653d477dbd018dddafeb2efad4/78282336674.pdf
    • https://calmoinc.com/upload/editor/file/6815887984.pdf
    • http://best-infosystems.com/userfiles/file/katusif.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/mif7gh81ostdkfrua34eoe8j03/25639780753.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/878p1627fnukmo6r1ma63heiiq/bomolosodizabaresupam.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/dsdmahp6eb9lrojh9957imhk0m/rilavilavim.pdf
    • https://kodcomputers.ro/2664/uploads/rojatidamabonij.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/da15803a82b9ac4d514c4f42d7e153ac/lujaxemo.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f6090a5c40612a38f374b6d4f6112939/sumupaxerabalefojusugoru.pdf
    • http://menafundinfo.com/userfiles/file/16893514618.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_off00016d0d.bin
f993ed0254c821e43426b090c20ab17842f5e13ee1e9657cb28939617b600f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D0D 18144 bytes
font_01_sfnt_off00019d21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19D21 16792 bytes
font_02_sfnt_off0001b538.bin
4903adaf5ebf5942470a323998f9accad59d42850493ee8b6cb87bf51335c30d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B538 10380 bytes