Malicious PDF — malware analysis report

Static analysis result for SHA-256 84567fe140a6d9e1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 10:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2bb9fb70ad362677123e43568b28b7bf SHA-1: 406e1cc7dcbe648491ee63d2b7dfb588c52da70e SHA-256: 84567fe140a6d9e13ff442c65b99522c68ebfad8dc910e085f60c258317b8cce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver phishing content or further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=games+for+snes9x+ex%2B PDF link annotation
    • http://zsdbiopharm.com/upload/files/zosakenaxazenuw.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/wokuzuvo.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/6452522295.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/61792610064.pdfIn PDF document text
    • http://sun-eko.eu/files/file/gogetagolizurozibij.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/mapudimeleze.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/xidupi.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/bujum.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tigovubekuwumep.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/kupelivexariborolivujukeb.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/1269001825.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca0c53b557---nusupoji.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/maruzewedawor.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/dunubopuxavowagukilu.pdfIn PDF document text
    • https://tigapilar.com/upload/files/55255701069.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/33230558476.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/woropilodupanuxi.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bcvvhebodsg6u9075ml8kcvff1/wudulegajulumirujafutinew.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/74936647499.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/2012032026.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/wobozifawamidijoboruberi.pdfIn PDF document text
    • http://sro52.ru/uploads/files/paziberabopuwebonatokus.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/66691181387.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146699a640a7---36046639122.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/nirepaxajibiwud.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_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 10448 bytes
SHA-256: 28fb3595445d5101416dc7fcfddc6bf57a22fd1bce1a7f50d4746ee521b168a0
font_02_sfnt_off0000fe90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE90 20800 bytes
SHA-256: 1484d8480207eb1a88ddfa4b97b4b0b05ef78aa867828d77042ea2b2f43f5946