Malicious PDF — malware analysis report

Static analysis result for SHA-256 995b75171ded9773…

MALICIOUS

PDF

66.5 KB Created: 2021-05-18 16:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bba03bb85af60a2853169b8bda0fc302 SHA-1: 4bd166be7296eec50ce07ae033396a7198ac1a66 SHA-256: 995b75171ded9773923baea8e10888df591c2e44b671cbd364c1e87dec94e6b8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of multiple external links indicates a potential for redirecting users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7aa2f5519b5e6a553cb360601314f407/10737229109.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f3eac4372e1d42a708bae5360f89e0e9/faromokabunusof.pdf
    • http://travelport.pl/userfiles//file/20963468064.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729ccc758fd---fejajaxurizafosobevesated.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e673d0bee6---74395201507.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160768438e82a4---99930304018.pdf
    • https://aprilboya.com/userfiles/file/43747016550.pdf
    • https://arte-salon.ru/upload_picture/mezojodozo.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083acfeb6bac---47619120186.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab97a00c9a---fobokaj.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0q8an17h24mqbgk2ek8t6mne74/xapafixawunepiwagila.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c4943cab---55595533834.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/50eeabec6631104c448cf5bb2a3a86bf/viruguloz.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/39299045044.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=identifying+linear+quadratic+and+exponential+functions+worksheet+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d026.bin
30686ff0abaefee29f5ccc7594a8613093033dc171b830970751f2bb24318110		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 5804 bytes
font_01_sfnt_off0000e400.bin
d215945a627e59dfd341887a0043d1e2450ec1bc9cef367dfb6c25d91cca649d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10368 bytes

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