Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b3d26463608d5c…

MALICIOUS

PDF

74.7 KB Created: 2021-05-06 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 011e737a8697058e202fcbe824125326 SHA-1: cee381968a5e56583235b2b52fe9e0ef2fbe9cf0 SHA-256: 55b3d26463608d5cc7d57af89dce2f269f5b12fa215b10ae4b4fa5d8a29f5cf5
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8749

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
    • 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_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
font_02_sfnt_off0001121b.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 16060 bytes

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