Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e1394db4e8b7c1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-16 00:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96e71cb5f6a800943eb45574bfed0b17 SHA-1: 4931a8ae6f29972e90964c3c7ceb045c1b9fb431 SHA-256: a0e1394db4e8b7c1dc5458fb8f4358d17d327f5a5fe09e53c9b09d6818e4e590
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting. The presence of 'utm_term' in one URL suggests a phishing lure, likely attempting to trick users into downloading unwanted software or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=download+game+my+virtual+girlfriend+android PDF link annotation
    • http://hig-hegmann.de/userfiles/file/ruzuzanizuromekazoga.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/zonosevifu.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/91853992909.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/61506118781.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/bekedejimufi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f6f5084344a39bcbb037753d8d0aa03/gomekogugegudaver.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/40785766525.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kikaz.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/mamalagizusijasubijuj.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/13024295409.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc73878da0---39503257363.pdfIn PDF document text
    • https://emenu.hu/editor_up/gipitokuwaze.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/96397817093.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/kisabeguzozogixozevifixij.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/kikeredujoramogidax.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400ec3192b9---fesajesapuvepuz.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/52078452958.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/82807903117.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b5dd83c383cb0d02454f9d40d84c2e90/diwomexeweg.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0c52lc9ddevjs80sjj0sbsmpm8/wufigojemilomemevuvopon.pdfIn PDF document text
    • https://mytopics.it/uploads/file/mogeduxivaxutuzituvaw.pdfIn PDF document text
    • 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_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 15116 bytes
SHA-256: 8addfa764184a3ad19e4005c305c9475d22e6743b4d44fb3c71f2a77eb5b552c
font_01_sfnt_off0000db8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 10896 bytes
SHA-256: bd89869ce352c56441b50f277ab96f0bb58d2a55f73fae050cb622ab37e9971b