Malicious PDF — malware analysis report

Static analysis result for SHA-256 3455af8c43887228…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 11:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1dd8ad36c91f0ef6b6263ca249f052f SHA-1: 8ed64b7d174ec547018cda6fc4345ad40e356d9b SHA-256: 3455af8c438872288a573c4bd59bdb20bbd2009c89b4c958126d5b5813770224
156 Risk Score

Malware Insights

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

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 related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160782d86235b1---fateme.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/36gc9mfrrib0qils3k5tohcre0/natifurudele.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b44f73d05dacf6668206f7aa6179e658/lilosisilo.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083cca0024f5---fapad.pdf
    • https://namratalakhotia.com/userfiles/files/93982710588.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160976fe62ffc9---reposuniwepufofuxuwonabet.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da6143a242e---kekatupojupekekinumiji.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6f300ecbf20ec4e73a314f1c3330ae34/pupusebobiliwonupawexap.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4593d07d35---wirusa.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/1e24118fbcdf25dbf04d30978e41085f/zojubegirapotajijowozex.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160babf39a9241---76674139534.pdf
    • https://muzeumkonstancina.pl/attachments/file/pesirawexisarigipo.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/luvubexirurajipoganunadeb.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a260535dadf---41716484464.pdf
    • http://cecev.com/stockages/files/33164592360.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d50f56bf0---gabututejibizufunimugu.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/mi2lidhth0aenhm77ps0pfpf77/tikizerelupeloto.pdf
    • https://my-natural-style.net/upload/files/tebukuroxopovevu.pdf
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/31084855375.pdf
    • http://oumkua.com/userfiles/file/65748006027.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788d1393bfa---zotafelobulenebi.pdf
    • https://akapacha.com/userfiles/file/xuxodoxogosobuz.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7de72753a2ba6a3515fe1a123472b652/5890199854.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sincere+without+wax
    • 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_off0000ee30.bin
eac6c626b0a5f141eec8a88c9c78d7d5d38eeef4af2d4734beb78d3e87ae3914
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10476 bytes
font_01_sfnt_off00010604.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 16792 bytes
font_02_sfnt_off00011e16.bin
7821c701d562eff3fb65e8279e1d90cfcb0811b7e367e17b841ac4ecebaf6b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 17236 bytes