Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec609428e9f5900…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 14:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e7ad9a887a5ca2ba191faf377a5e56b SHA-1: 06ed1d630a3a5c42e8f6063334d14c07d65c447c SHA-256: aec609428e9f59002b082e0d1299a565d961fea7f061f463d227540477ff0564
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://eminentland.com/admin/userfiles/files/nedajeziv.pdf In PDF document text
    • http://cephedanismani.com/images/pages/file/doram.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/97294684407.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/vulakozidelefolasavimo.pdfIn PDF document text
    • https://ivanamihic.com/files/dajub.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/27656036959.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/jofixaxenazagojupixo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161428fd7dbba7---364541447.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/zomezurevejafaweniduwum.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/kubupumuwuwipilexasa.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/nuwov.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/moroluzijosirepez.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/welawajum.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/89515371919.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/6238922459.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/36620084350.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/63057271.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-01-08-36-47-41.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/s6h3kvf0ioplcrtnpee0a3ihph/10625576354.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3034df9c47d21992c87058789952735d/wenefuvu.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/5653893933.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/zosamivivideninu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/volopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=code+redeem+for+genshin+impactPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 11052 bytes
SHA-256: 16d7ed2a72c431d4285ce9552703b3e8dcba5d4dd4a2161e3ebe7379cf1258b6
font_01_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 18704 bytes
SHA-256: 9d64676b90294b32e6a193d5823abc0862cd41ab24b335cf4d5a12d7ede90521