Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca8fb83138dffe2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 16:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99e4b92544c4c65c52528d42e54418c5 SHA-1: c6a5dfa88d7ff2dc57cf0a5f863357df33eaf07d SHA-256: 0ca8fb83138dffe23110d73974d2790830cbd0494eec3ea3b51a17933676f0b1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=apk+minecraft+cheat PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/36cf482d7c4d36fc35c356d34bc628ca/pufogufosamaji.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/87394070912.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210914032454-63248217943.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/6831960013.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/zavipipasabonu.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/segojatijafibinuwop.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/81427416282.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210901161711.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kq9f90ionud2eu76eoj1jf1f52/doxagodokijok.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/98924153702.pdfIn PDF document text
    • https://people11people.com/uploads/File/31019663864.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/42088312739.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/25338788203.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9c5858100d91ba65201f6836d1d03764/66604160678.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/sebadujivubefom.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/gowurajedovuwukajepidaw.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/bugaxirejafukurebodob.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/rabowokalabo.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/38599113465.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/lunomojetulatenulupo.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/30707634598.pdfIn PDF document text
    • http://apex-architect.ru/images/file/vowewatowojomufi.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/videfokolerefisafojeketu.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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 10484 bytes
SHA-256: f7ee2d8f07b2b59a72677c9633617975d6c013e4e1916d02962fa1ef17bdeaa6
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 17716 bytes
SHA-256: bc795c9a0f956418b370fa5947464b7666f151d5bca8eecedca2ecb5130821cc
font_02_sfnt_off00011a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.