Malicious PDF — malware analysis report

Static analysis result for SHA-256 8044b0460609a22d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 16:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c623bd7cb908389a14a8c07adea55e69 SHA-1: 5450e61405328c742e0485cdc5d275387596c8d2 SHA-256: 8044b0460609a22d7a6f755b968ca841412bc84c70b02f06a640106a99a10305
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6012

Heuristics 5

  • 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
  • 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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1afa65915---sazituvoniz.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbcac1c119---pafaxow.pdf
    • http://tscyw.net/userfiles/file/20210704173633_3aizn0.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1ad9f3e7e---52287897629.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7db4bbcd9---40211654220.pdf
    • http://sumosushingrill.com/uploads/files/rulolofe.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f74393169d4bb6f378ea5aa30038f977/wevorubazur.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/nofevotosajasutidilud.pdf
    • https://bloomlight.pl/_bloom/file/25109179360.pdf
    • http://chiaranannini.com/userfiles/files/38013770538.pdf
    • https://posh.hr/files/fonexorixagidebaridoxapin.pdf
    • http://diysmart.net/userfiles/file/pajegiramepegijulureme.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/27100543324.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f0374c8e---92598652063.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3763f3039b6436dfaf7a984060e75b60/86966952775.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8e57f1a88---1975257371.pdf
    • http://qtjdb.com/UploadFile/2021/09/01/file/20210901_041023_114.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e5e81ec06c6466f84ecb29cdc8aec03b/degoko.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160813dee8d565---kopawa.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6fcbe24a4327bfedaaf8791f1cddee8/54359800066.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/974346d1e10d99cd79bc4728e59bf9aa/37747846445.pdf
    • http://mikomisushiwc.com/uploads/files/pekuvedawitonosu.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff19721c7---10631149716.pdf
    • https://caribemed.com/userfiles/file/79672780613.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805fd329218---retosekipupevowubomilimew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=javatpoint+java+tutorial+pdf+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011188.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 16792 bytes

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