Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2b9639b46fb087…

MALICIOUS

PDF

97.0 KB Created: 2021-09-17 18:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06cd3e90d851f209547a7d658f589d0f SHA-1: 75b47f509034182e0d5eb034f43b6e20da22b2ca SHA-256: 0b2b9639b46fb0876f5073a617eafca70a458176647b1e8114c53ce3940fe74a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://queure.ru/uplcv?utm_term=dragon+ball+super+episode+7
    • http://gnatowski.pl/attachments/file/78115211905.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/649822e75d5147861fba2ce78aa66a96/24219229815.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/wutoterakafulepof.pdf
    • https://sskundal.com/userfiles/file/nazoxuvoro.pdf
    • http://dglytbt.com/upfolder/e/files/20210901171321.pdf
    • http://ventexevent.se/uploads/file/rufumuxumapibosuzurepa.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/dupovukirubev.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/71902380288.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403e601a91b---80443873053.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/dgvo2f66l82ghn8ru7a44augp9/38888926828.pdf
    • http://royalwedding.jp/images/blog/file/63213653977.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/kudaragatok.pdf
    • https://condicionamentofisico.com/arquivos/file/29809433544.pdf
    • https://mandarinkinesiska.com/userfiles/file/sisas.pdf
    • http://vietkinggroup.com/uploads/userfiles/file/padiduvazusumanagitakig.pdf
    • http://antwerp-reefer-tournament.be/argt/files/sekumenuvorodixikuvar.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/75138990578.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/jokekatofekogokemexotaj.pdf
    • http://pokeocncafe.com/uploads/files/kugudipif.pdf
    • http://ave-france.com/pics/files/nexiwitime.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210909_90DDBBDDFA82E6D1.pdf
    • http://gocep.org/data/userfiles/files/29326995850.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/55020940133.pdf
    • http://thankschicken.com/uploads/files/notiwugijilewa.pdf
    • http://pphu-joanna.pl/fckpliki/file/86034487925.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f64ac6320f---dufikigatudezu.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_off000113f0.bin
d8857d307ec6a26db579b3f8ebf5584ff308a4d2944671421c96e981f0759c40
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 19264 bytes
font_01_sfnt_off00014641.bin
15ec93c4e78d7f45fb5a860a31ea8d5b1b377f31aff6beee2bd18d02068c328c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 10760 bytes
font_02_sfnt_off00015ea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA5 16792 bytes