Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9fefa8f46cf4f7…

MALICIOUS

PDF

92.0 KB Created: 2021-08-21 12:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 638b89d88bd421509e03ffcf24208e9d SHA-1: e358eb74b105ba71038cdd8656140e2242b2ec72 SHA-256: 5a9fefa8f46cf4f7af3da5c2b4ee002f04aaaeca5c99dd5de394596c47882f0d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits malicious behavior by acting as a link farm, directing users to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the presence of numerous external URIs, many hosted on potentially disposable domains, suggests an attempt to distribute further malicious content or engage in SEO abuse. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 https://synerhu.ru/uplcv?utm_term=.400+vs+.401+bullets
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/04c693ebcc603664377908f27372ac83/lilukifevel.pdf
    • http://jarosi.hu/files/file/puvimiwapubi.pdf
    • https://tsydesign.com/userfiles/jws/files/29394372828.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/0220a06ba3cd6233bd0667e7b4fec4d1/mifiwoxufimawos.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27e3af088---pazizividu.pdf
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/mevuzetupoxotovosavozip.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc7eb496a8---53834275949.pdf
    • http://progetec.org/userfiles/files/81134874146.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/66516453391.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e2600709---45576423544.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/98870578498.pdf
    • http://vectorma.ru/uploads/assets/file/fulapakajojedimagiwe.pdf
    • https://qigoodteam.com/uploads//files/202108120742284966.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jibizupefarakarilezumo.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/totebuzirojezokuxef.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d768ac73---dujiku.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/p2u395fbc4bn4kkcmgl3gruje9/42500595128.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0d4766b7d0e1f3322f929fd7037f30ad/wafojolozagef.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/xenolibifowutijajamek.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/5663b1e1ed14ad6ff97a9b61530fc22b/46563188658.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_off00010317.bin
ee05ad0fb57dba927ffd9f099226ca84fe0badd3fc4c61c9ec69aa3ece08d161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 10048 bytes
font_01_sfnt_off000119b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 16792 bytes
font_02_sfnt_off000131ca.bin
043c32bdf2ddd5bfd87f8154e1c15a1f6c94ae48198c5ca6be9c0486f2d51ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 17964 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.