Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc0a9b230290146…

MALICIOUS

PDF

147.2 KB Created: 2021-07-23 20:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7ecb6aac0694785d7823bd77ee97bf4 SHA-1: 221fb3d6a73c6bd470ab2bdbdd86bf3790e7d6ee SHA-256: 3fc0a9b230290146c9427dcb118d3f31ed8f664fef0911225a7f1447f8527cee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. 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 malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03cdd378e7---mitovumipujege.pdf
    • https://777mto.org/contents//files/mukexazaneseb.pdf
    • http://concept-art.nl/app/webroot/files/userfiles/files/xadosajorowa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49390e125---roxukagovitubojiredowuri.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/40c4322ad98415f1937ed7cfda3480dc/tujifaxuzarizasivel.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887ff652f1b---watalodipotixagati.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0e65a5398d1413a6ee8e5db2d0d8c346/lavobagumadigepeled.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/36cebe92ec1c9487426d086c68b9105c/nuruveka.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7d23ce52c2830af68372eb9b2d197585/gejodazukeg.pdf
    • http://pileshoppen.dk/userfiles/file/3894212093.pdf
    • https://hzautomatisering.nl/userfiles/file/84969661811.pdf
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vosowunixawe.pdf
    • http://denprokhorov.ru/images/file/57510568320.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/bugititowukokupavuki.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd1eeddd4---52463493104.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c026cebaddb---fudigutafedodiz.pdf
    • https://alakharia.com/public_html/userfiles/file/65336083356.pdf
    • https://salvatoredivilio.it/userfiles/file/nalajexenakisivuwo.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4a69b5cda4c9f055db74eecfc5088402/90971781263.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160754879d6d11---dotowuj.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0ebbfd310c3dcb5d311cde476345a012/47580676458.pdf
    • http://dentish.ru/ckfinder/userfiles/files/42380330679.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+pokemon+blanco+2+en+espa%C3%B1ol+para+nds+r4
    • 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_off0001dd44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD44 16792 bytes
font_01_sfnt_off0001f556.bin
52d9717e1a7e28d0673c31dd5bb58a6f7ded9aa55a9a44bedf8965e647a837a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F556 17664 bytes
font_02_sfnt_off000222a9.bin
be85c1ea74bbde59f9d03d06df7f5e66eed94019c3b33cfdf9ef67be6ffb71c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x222A9 11304 bytes