Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9441b832c111cde…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 06:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 886015766b884ed7aa2dd7a4fcf757f3 SHA-1: 372567e698b58e8fe3438f7e7ce84ce20c505f05 SHA-256: d9441b832c111cde694ccb2c56251afaf8f9a6c1fe83a200900f6fb5ee4e385f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, many of which host further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and links suggests an effort to obscure the ultimate destination or to distribute the malicious content across various platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b467bc977---52425810070.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vr58dp7mg5nh9bir0o0f55r9e4/44414401691.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d36d196848417d279dbc504c9b06aa37/54409487034.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094477b4a39e---jawizuvozabafozeba.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/1f63bca08d89a59ee5771b14369ed367/99168442866.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2b1eb44435e4c78a43e9d601893dbf40/renosun.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/kfd9ckunoup7knh58rm7p0eeu3/miwejaxaborukuzuvokub.pdf
    • http://namngonviet.vn/user-/files/welepudinilulobisu.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/bea596af9b5a3e33be02994436da3068/10808053373.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e92e978c4db7c0cc54e596b32b31bd33/80475802442.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081b69367c9c---norezapuxagatiwewubinifu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50aa10f7b---bagawagumetagabo.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b6b4bbca276---gadepizipizolalekaj.pdf
    • http://esipro.lu/userfiles/file/47946332497.pdf
    • https://sce.tw/uploads/files/60b4cbc4cd018.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f4e3320e---gesegisekuxido.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3e6f816dbac0af5e2dca97084dfd45ad/74368748167.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/04d6441c1539387a256d797129ca7e46/58551239506.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364586b128---58552218456.pdf
    • http://lycee-elm.org/userfiles/file/99586636588.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/suvipatenaxisimemoto.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099312bbc554---68378644325.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a2409dd37a2ad6e30aa3db3dbae7cf7d/49370938909.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607330bb46453---61222706795.pdf
    • http://holyfamilycyo.org/clients/37654/File/zeduko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+connected+graph+is+eulerian+if+and+only+if+the+degree+of+each+vertex+of+the+graph+is
    • 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_off0000ec96.bin
c71dd4b166c5e7877c99244f28794c30d28b7301c28e27d96aef4077e0be592e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 17212 bytes
font_01_sfnt_off00011992.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11992 16792 bytes
font_02_sfnt_off000131a9.bin
42327a3b3d99c8ceda8d22fa0c9bed81901ee3c0ed41735e53bc8f7dea113431
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 11264 bytes