Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c46367aefdd0c80…

MALICIOUS

PDF

90.9 KB Created: 2021-08-09 14:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0f8dea3a77c46b33a8319548714fd87e SHA-1: 80dfa83145d535060e65995ee6734b2e4d32d253 SHA-256: 6c46367aefdd0c80205ba3f09b55b61e4eb9f01a3a5309473b5dac336894b950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The presence of multiple PDF link farm heuristics and external URI firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=manual+tp-link+tl-wr940n+en+espa%C3%B1ol PDF link annotation
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t36sb4b4fl7pasd5ref4sbp29s/18456291171.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff611c2fb---30280381269.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/molik.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609858695bf77---27008957578.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/69982360856.pdfIn PDF document text
    • https://nevisnews.com/userfiles/xaratujotiwu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d221f2b8c1b98fc994ca5728dffdc7bd/febavojajazixomagev.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6cf9a157b---70742787586.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/texirevemetipixu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/54a50dcdb31f0d356138d6f4ba985072/70901934520.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e624cc9708---dasujovegulikakode.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/38661997032.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/89277439459.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/lepasiripivogo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16103bfd832bda---2795233708.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2qmvmqkahg1pmuosta5k0ou0m1/zarorijatafoxo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3de77bd676a4575207a7bb782a56bd5c/tozavibedasaxegovidunevaj.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/bibawuvitikopiritila.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/63221686920.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/pusav.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099d74f968ec---68130056430.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1e010431---kafavumupobadudexedamuvow.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/88e6439463626c884ebbaddbcc7ce2b3/titewivoxamugabugetoburep.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_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 20068 bytes
SHA-256: 113d9e7d203d1aa4687a6c31bb6ad6c58f764173cbff846e515073407d899c7c
font_01_sfnt_off000128f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001410f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410F 11124 bytes
SHA-256: 17d7328a6d76d68a5bce2b819e47277d14de90ca89ef64d6815ba1c6e3541313

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