Malicious PDF — malware analysis report

Static analysis result for SHA-256 daedc14117447fb7…

MALICIOUS

PDF

88.9 KB Created: 2021-07-16 05:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d02e53783a79bf9a2ecf0378db85a4a SHA-1: ac5e95d8d5a183e381af6ccbc4d87b95a5493456 SHA-256: daedc14117447fb790e93ec065f416afb9f5546788e58b6289e8570ef542dd27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content. ClamAV and ML classifiers strongly indicate maliciousness, and the PDF structure suggests it's designed to lure users to these external resources. While no scripts were explicitly extracted, the nature of the link farm suggests a potential for JavaScript execution or further redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49b85df794---67919758047.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ea959576---21687287859.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/g1unner30pcnmtjpmq5qtllkj7/77457724490.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kpmmd9a03nc9gtesl8au7du9bf/40978311201.pdf
    • http://bagiez.de/userfiles/file/3720026977.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6afbd554dd---12410877337.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/fm7l1qol3o2iqpob9n8cb9p3ol/5979850232.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/24fc89b2e2f31f3be9bce7c078a5882e/18432293866.pdf
    • http://vizcsap.hu/files/file/41783958775.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d336346d817---nezubokifalugonanavofe.pdf
    • http://www.findvoters.com/userfiles/file/15908395732.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6am639ss1u868aqmp1oqt7fjg6/66428596745.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ed1120c63eb179e78b19625aacc3fe2a/gekuwewuvu.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e6b30352472c217293486f4d422fdcd2/diriwat.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/idhvo3lu0lc63nungbv904bv21/58011055017.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ab4270bfc---dazilu.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9729dab8---ketukozog.pdf
    • https://growyourmoney.in/userfiles/files/ropabomafireseve.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5185a6b115---31434716716.pdf
    • http://skomi.ru/img/files/file/39326360026.pdf
    • http://sdds.be/userfiles/file/93944422192.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7587bc4029fdafd9ea0e3490f642fb48/jurevagofaluba.pdf
    • https://audreyheselmans.com/_files/file/47971385960.pdf
    • https://marosme.ro/hirek/file/71203107562.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5cd3dbb4---81775684926.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9fff7ef77db99b1111862bb05c796026/70260150785.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a502c365c36ae0dc9407b9b8790d1c8a/nalirikokumisibajo.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lopewifakedumunaluzuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=water+and+land+living+animals
    • 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_off0000f7fb.bin
8f3622ae75aa2a147b13a82cd60bbd5865cc43591db980f499a12da20b341076
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 10528 bytes
font_01_sfnt_off00010fbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 16792 bytes
font_02_sfnt_off000127cd.bin
c6b6e48207cd0773193071ee8398b8a04356ff6018c89ef86ee1b08e19aa4a17
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 17620 bytes