Malicious PDF — malware analysis report

Static analysis result for SHA-256 4818a6a39607632c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 02:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7182730ac0aa3701ff5b240b84847ba SHA-1: d58efdbb14412ca7d393f409fea6d22ccc25d7eb SHA-256: 4818a6a39607632c46dd5d7970ec91a279d33f912ba696ee7c60cc53811e4d2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81558bee6---1159930151.pdf In PDF document text
    • http://ucity69.com/clients/861769/File/64740459162.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kimepugeduridifanap.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/11516832418.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4cf2476b2---54127380052.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f24c61b25d445c89cf8931b82f53dafe/gefavok.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/fovobefadalilogaboxi.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/piropuwudimizimorubexi.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/kevotewokepiloresep.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jpt9l6m3eu0kmrp9t3ohghsbcj/53783230083.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/q087201sifh6frirbra13rglmu/82390562668.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/3362252554.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0219284943---25067984454.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pl1c98is5meph77f3od61r1mvi/lanagexatobinizimobusizer.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/xipeforuvaponuwoxusisize.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/fatilaxedawisiven.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ea40dcb0ce7e7ac3a3b745358bba117e/tewutuvuxaxiresokomu.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/vomutinivezanelisu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/bf1ccf47292c08ee5470df22c0cfff38/34192545974.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tuzixened.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/07bc80d064d27d176531f66181b6adb4/karazururudajupebipo.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/fisobenojoxuba.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dm3d8h6ood03s52cfvuhnss6t6/6018954216.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/42924588947.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c796d0cb4572725df7f22d80fdec61ae/kufewozubiwuw.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/25414901889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=personalpronomen+deutsch+tabelle+pdfPDF 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 11032 bytes
SHA-256: 3aa7a9dd47a91596ab87050d46d50af8ba2e31ebda07c90a3e63b5cf10306a09
font_02_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 19816 bytes
SHA-256: a10fca289140741d0a9cac1518419a5cc94ac4a58b225154d87bd661555c077a