Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08a5c92bca62532…

MALICIOUS

PDF

72.0 KB Created: 2021-05-06 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7aff9a72ddde5ff6d3390f6e533597c SHA-1: bfaa97f0b3d1b5e528247425279d143d78121c3e SHA-256: d08a5c92bca62532d77f56b7b86a830196eaba0ab569ff23ffdfb7915b3eb4cb
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7642

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://philabc.ru/uplcv?utm_term=epilepsy+guidelines+2018+pdf
    • https://angkortaxiservice.com/userfiles/file/retegibu.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092f994a4d37---81213647908.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/00ae39e7435c40102ba8acb8b42e68b2/85651101557.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/37367d50752376dcf9a22c866af79d1d/77356407672.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde142bc27---tabavizetimerogoxeme.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e1d9fa25---rivenatovevumavegakazidu.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cc48a24671ea2d2ab5928a9bdd1eb8df/11258029291.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ad2f182d---fazatopixakobafodoxas.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160745a5bcef80---4827303636.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0cgjh9hvpbhn2k055f7u4bfi13/28545802711.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8dc6fb05---96967091124.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56c48c2fe5154547f5dadcc2bffffa90/sonorogofirakexurosat.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/810f4p3mblrjb4nj4jk0tnn6vi/21472282383.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917ea0489e5---bukaj.pdf
    • https://a2designbg.com/userfiles/file/zutatumajezose.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/af7ec111bc7f48f250845f7f753a60e3/66204145121.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5320a49d---gelum.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16085297760b4a---vaxov.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_off0000da61.bin
928e68f0b6674c5397b23588a873734bded28e760f01e60d49507147354cd03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 5480 bytes
font_01_sfnt_off0000ed38.bin
1516fd2629914d7e5324fa37efefad3ea7330e2e22d46cd92b78cb32945972b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 10708 bytes

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