Malicious PDF — malware analysis report

Static analysis result for SHA-256 308c546f131486c6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 08:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c64a97a07d1399a2758405892d96d53 SHA-1: b6a8895bf1797ce1e574eda0df7ea55847134433 SHA-256: 308c546f131486c6890b5fd46e561e8167a36420fd1d5cb0f6cf416d8b743060
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9053c84a2b---vaxiwumibux.pdf
    • http://rungrawin-itt.com/userfiles/files/vemurodani.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611211cd161d5---foxufopowevusa.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/7vuemvovrdfpuj52adusjjeaf5/41170818367.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe0dc8a622---20809837818.pdf
    • http://plastikacz.cz/soubory/files/zusunikogefej.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28ed9cf5f0---41410583461.pdf
    • http://ahkjt.com/upfile/file/kikefunumomibavizamuj.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f123fb9576304db2eaf3fb7ac25ad56c/purutipomidelu.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/23331071821.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/g79t9317t4ss6ikji2hmg396po/mogokikizewutosujap.pdf
    • http://architettogherardi.eu/userfiles/files/47436428483.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d44f19ca0b8c3a197399fea1f98c45a1/1614919709.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/cdmchhui90rukcd1mtl6nrhcji/rulow.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/87689243501.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e4ac38398a45f9a4b4928858445e90ae/veboxu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9015b69fe---moroliwipufimovi.pdf
    • http://edu-family72.ru/content/images/uploads/file/35109460863.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e90f70ada---gexoputasupepewigekus.pdf
    • http://alrabbancapital.com/file/files/nipajaregoperenigitu.pdf
    • http://asea-admin.com/_userfiles/file/20210807012703.pdf
    • http://kalmi.ru/upfiles/files/lufubemi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=charlie+brown+thanksgiving+piano+sheet+music+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_off0000df1e.bin
4b4b35f57396ac74a8a2976e5aba6d9416472c15981f6b09101613e7badc996b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 17360 bytes
font_01_sfnt_off00010bfb.bin
c432c23cff9f79d4b29c08266e7f2abd61d04903ac4033c75794e222d57c3233
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFB 11584 bytes
font_02_sfnt_off000126fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126FB 16792 bytes