Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9303881bf8139e…

MALICIOUS

PDF

69.9 KB Created: 2021-06-19 09:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3b80c0aec29fe0e91bf5baf968595e0 SHA-1: f670e9e6f5d39a02b45ad6cb06e81f0c5aacf32f SHA-256: ab9303881bf8139e21ef47e473dc9151ab91376c867d8ba71e86fd3d28216471
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8311

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 https://huntic.ru/uplcv?utm_term=mixed+conditional+exercises+perfect+english+grammar
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9447f35d---27121674811.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/92a1e4dd52f147deee7c16eeabd2768e/55699569484.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d21d0cb96d---28429333621.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a7abc5bac---16997968272.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fea61611b7b81c20cf5b2757881cc25/lunaxof.pdf
    • http://activesolutionelectric.com/images/file/98391988134.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab23f0de203---pogenofobezuzafebi.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/r60lrhsaoe1ibdce0dpn4ovk17/goliz.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092f99f39728---64143796932.pdf
    • http://sparkpro.lv/content/file/zosemadefajamaje.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a57426d3e7---bopajo.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608359b9720ef---kijiraketazaxe.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ab0ac9d8---konosofesiruja.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/93a48bade481ddedb811aac73d3a4a54/gododitowunida.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/510aa9ff74597afb0da50d4efc70e884/35092057742.pdf
    • http://beiwendq.com//data/attachment/file/talan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cb.bin
ac1297199e68df6519db66f4a3b12f6d5dc0b94208fde62096734f9125f06e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 5644 bytes
font_01_sfnt_off0000f7eb.bin
1a0d2bc74429a5b373c8f62b6d3426d309c15a29cd84c9839417b72dd88f4915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 10712 bytes

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