Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d19f8463835e6d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-25 04:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f902646b64fbbb6e26d1bd8debd2a6ca SHA-1: 968ffa242d4b094becd94b1dbd961f69a2d7cf7c SHA-256: e3d19f8463835e6d75113c21a95d5f68b888c71efbecd13a0b9ffc2ba5feb336
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains and compromised CMS uploads, designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://evrofurnitura.by/elax-furnitura.ru/uploads/files/48618661986.pdf In PDF document text
    • https://angem.fr/userfiles/file/14188304884.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/kobirazezowozi.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/6605456447.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fujaxabugapulopex.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161335dc1f1a28---sikakom.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/furemokanomajomubipudurav.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/33487180448.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/xavenivitemovusifub.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/84212644600.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/12605577055.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/63199084877.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/kaxowuz.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/15515476412.pdfIn PDF document text
    • https://fototipia.hu/files/files/sumejibelamutuxikodiwefi.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/lorufuxagififajajo.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fuwarebisemurev.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bccbd18482---207108984.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c310caff6e---58329720720.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614afe4f1f704---94927702232.pdfIn PDF document text
    • http://miminku2.com/contents/files/13734124039.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/76453511023.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/2716782609.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/tuvunav.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/53793277801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+kodi+18+android+tv+boxPDF 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_off0000b761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB761 18988 bytes
SHA-256: bb8a1766c18799940f81cd3cb2f1f2179e3494f1e2d316f130771175e85f8329
font_01_sfnt_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 10688 bytes
SHA-256: 94c0ad53eb327d7e5170d8a3047ebf64dc12ebbe66946227018c0caa75e6df9b
font_02_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1