Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3478d8c94c0f39…

MALICIOUS

PDF

75.5 KB Created: 2021-06-26 10:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a94572714ff0107d6a6b1eb84f65d660 SHA-1: 6fa572f9b9da34e19e2022b615919cb15d5c8abe SHA-256: bd3478d8c94c0f39d91f81959844e54bd838a939fa456a5d012d3720f03d4aca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and embedded links indicate it is likely used as part of a spearphishing attachment attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://drafthe.ru/uplcv?utm_term=questions+to+make+a+man+fall+in+love
    • http://ekotronic.eu/files/file/99659835489.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3442e6805b68819944e154d3672c9f1b/65133230484.pdf
    • https://ratsimae.eemedia/contents/file/bogulelolorod.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b83e6989d1ee4439da76e1937d774e49/povuzowawilupolobevo.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/s8v6c940tt34esgm3ncd8ih70p/sawosajubejaxalipoz.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dac5a061e---67839750530.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9f5432a8b---22262262273.pdf
    • https://auto-rujo.com/images-editor/file/vakoka.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070f333ab773---suzered.pdf
    • http://ateliergermain.net/sites/default/files/file/31998300420.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2ca9b674eed337360600b635ce5bcda3/gejunudiz.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/14297961035.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607321e182b40---kutaregaxagelexepavewupez.pdf
    • http://asckhn.com/acskhn/userfiles/file/99025697309.pdf
    • https://daaeportrett.no/upload/file/mepixugu.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/xurukajax.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4c2019cdde0529c5781e60f37cc8ff2e/diritefarolozorujuxilav.pdf
    • http://baovevietnam-vnss.com/upload/file/25207864051.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/72837554397.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160becd7eb7bd2---fofaluwuwulibejagujen.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a924467f92---xapuramunasasikamoveb.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff22dd462c---jepirevitib.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_off0000c71e.bin
332a92ecf24830d9012bcab5537896300c052dadf4828fbd1537747801a0dfc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 10592 bytes
font_01_sfnt_off0000df6f.bin
e58d7c35949019572e1ade9966e03d17c8ba5244a43b9ff0df08eb753181895c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 16448 bytes
font_02_sfnt_off00010901.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 16792 bytes