Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22f1f33228edf5f…

MALICIOUS

PDF

89.0 KB Created: 2021-08-03 21:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d66747ff88fbc4e7a35b06750067b3 SHA-1: ff40d687dbc2ad089c486d547424944a03a39275 SHA-256: f22f1f33228edf5f15ee878a01b1b6abee258f8081ac686650472d997a5665e6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/08fc722973e7dc1b7caf147bef343607/mazivaremiw.pdf
    • http://balogmihaly.hu/UserFiles/file/zifikujedokimo.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e9446f8b85f---banelamo.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pg9m1jb3afnrnblj1dk3404s1l/nuxuweridab.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9c66fed4fe9b1df39f16b8fee3e4973d/pubureni.pdf
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdf
    • https://thefertilizergranulator.com/d/files/21890277877.pdf
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/5640315062.pdf
    • http://bearings-home.com/userfiles/file/tosuvokirebadelojav.pdf
    • http://seamacros.com/upload/file/luwifibit.pdf
    • http://w-mill.jp/images/file/ramizavomokob.pdf
    • https://tideandtigers.com/ckfinder/userfiles/files/36304400234.pdf
    • http://parkhigh65.com/clients/4970/File/28385600808.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3a7b5d684---70354073145.pdf
    • http://nelly-design.ru/upload/files/dupogep.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/xofulajemoja.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deda3a4d59f---sotogutuxosamaripu.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/nekelubekukoduzeju.pdf
    • http://naszymsladem.pl/upload/file/rinerawinazolitabigovijot.pdf
    • http://liebherr-tr.com/userfiles/file/93913961041.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160969a01a96f1---gevotere.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f688f0527---jexakawugapuzaleviwa.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/279bd02ebeb8351aa6a8c039d6e63870/37591686485.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762944285f6---38031285861.pdf
    • http://headrepublic.pl/images/files/lebel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=el+diario+de+los+escritores+de+la+libertad+pdf+espa%C3%B1ol+gratis
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9b2ff34af250d2191740867da4369f54/37659140305.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000ef8c.bin
0b3183800f23ad941f9d8896fe46e9a86e7727456ee8a8f6166be564dd6a96c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 18912 bytes
font_01_sfnt_off0001207a.bin
25ab4d495d82b316832e1aa21b03f89608762894e2c7ec2293300e78bf424d4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1207A 11020 bytes
font_02_sfnt_off000139b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 16792 bytes