Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fad033c83f4d4d…

MALICIOUS

PDF

63.7 KB Created: 2021-08-10 07:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a84facad3fe4e839da07ef8378a5edcd SHA-1: 9b07a9214381df9a5ef8a2bd3f7e0e32b6e67354 SHA-256: f4fad033c83f4d4db539191b991f8dfdc8b631edcb3b701e2dcc88e458241066
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or redirection tool. The presence of external URIs and link farm heuristics indicates a pattern of directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9604

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18d94f19e---refilubomopugo.pdf In PDF document text
    • http://volkshilfe-ktn.at/images/content/files/57150110500.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b494749a30d---sasezizare.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/tukifoxu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zoxitu.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621567445.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c68b595da3d---giwetivose.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/31457351062.pdfIn PDF document text
    • http://abnicum.com/files/file/jumaxor.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/fomota.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/49593600105.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560eed6a53---21906190201.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/xufev.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079955e8743a---74717069961.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bb213e10f3fb309ada6567401fba5d43/befujiliteledibomukaju.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/80fp2rup8lh8ia25eu8r9vuouo/gufuruxezumotagigagike.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be6e0568090---1821872497.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/14365536028.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bab49b61a1c201b945d1765b46331e7a/sutosewav.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8ec6ebc09f80884364243e3909502a85/1341313471.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/76894158258.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o63v8441gmegalf2m0vpuji3mo/suterit.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9733e7e8fded903c08c71758285b7780/bunejoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+8.1+go+edition+isoPDF link annotation

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