Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cddb313a9388a0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 16:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4322094f7a2838acac946bd1c79b29e1 SHA-1: 00c68d777012cae15b0bec92c2efb75695f2b593 SHA-256: 82cddb313a9388a0d96698b74813aaeb51c6c9c6e4f95c697507d46d634f50fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/suzuzefoguzupajuziri.pdf In PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/14576481447.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56590482156.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/57176975127.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/vigezewupapage.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/83360725507.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9717m09u43ogaf98mhesimptm2/73871092575.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/fikufa.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/53718905497.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/lamunigika.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/tjsuuglno0332046ps3apl5f1c/41447238357.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/viritejupiziwiwoxabap.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/vapuzisok.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136207326d7c---1084084815.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/85262226840.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/boxumovibutewigesux.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/66783992463.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/94023678047.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe6267998---6575289707.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb349c3c9---16195699940.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/govabiregovenubilib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+play+store+gamesPDF 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_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10568 bytes
SHA-256: 95c1c87d5697b91413e34960ef48c2f333c88afea5967cd7fa1ce612b64360a2
font_01_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 17340 bytes
SHA-256: 461e9c316efbbac2fa99c2410e781c4164678ffb08a0cfb8d005dad562a4cfce
font_02_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1