Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a43d7825408cde2…

MALICIOUS

PDF

93.9 KB Created: 2021-07-01 10:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2e4b814c5e5295644fea36bfd0ff42f6 SHA-1: 2bdf8a53211bf221b6f8627398e8f512eb3df294 SHA-256: 8a43d7825408cde2070eb8377d5481df4ae1a7167bc3791c9acf8f44e17b3475
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=m1+carbine+collapsible+stock PDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bprgd2pd0oh9tu3krj7b0t1rs1/voniforifukedijalepol.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d06beea0835---megifiwutusibosofo.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b79608dcd7b---9918551341.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c19de546b56---zuwilibujumow.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/33019295485.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/30393339918.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b7b54f883265ff562545fbeb5feb91b8.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/2688e49b3d670b2f97aba2dc1b6bd4ea/94217685713.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d73f85fef88a8ee49954556a169aea3d/69520501016.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e644f1e08456178ad4f72079aceae93d/51810051041.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d64045ab65dcf16a772ed30edac0026c/lisunulorijafav.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a109a0evf6csm0o285b47vlcu/11492760842.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3d007c1f659cea74e64a1aea6fdf3bbc/46449725747.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/dc3b7d5ef1958a18fea3d51057713bbf/38115592774.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087248bc6c38---5163113039.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/18964100156.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/565d9babd6f9f015e5886eb03390d332/4160873115.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/80d72963b0f35fe865b40e411559d14f/49235771035.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085b981ce0d7---8060663924.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c289bf589da81cb182c1828218efafed/lobetosoxizapinexo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c083d982860---mazemenezibopisujoko.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/15416296985.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e0b795d0581865ad7fbfdb44cdd3b898/netoxoka.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/maxudusekewuvijuno.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_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 10644 bytes
SHA-256: 18d71ad6376cbf0b12df1f16e32adb8fd7bdce57f1160bbf88f889958bb71340
font_02_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 17096 bytes
SHA-256: 38bac41aae0dcff3ef8dc96d7300e51178133145663298218cf405a3cbe2a928