Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f435ce950d0818…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 08:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a04ca0a06dd839f612cca86d44631ef3 SHA-1: 5ea4c82577bda2ce0d02bf0b213851abc4f1d664 SHA-256: 70f435ce950d081865462bff5b50d9461209d2ee40564a72d75662db19b1e869
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it's intended to lead users to malicious content, likely via embedded JavaScript or by exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sport-jicin.cz/dokumenty/51444535562.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b112c4203---6540530376.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/32104186739.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/ganoxaxazisid.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/95128114098.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mudefomegeninutimevipifa.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210619070354_2sl1d3.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/84007011634.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/jisore.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f095f966---pomasalagidibad.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b53795c84a8---lamaxevaxululo.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16199297169707.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021617129476444.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/49705990850.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/tudapomuv.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/13453564049.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/kesewenemesofed.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/71958648219.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4105ec9033aeaa54dee34b6f6eb824da/xubaxile.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb5d6761c---25326228034.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/puzed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=anuria+adalah+pdfPDF 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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 17516 bytes
SHA-256: d5b1f3dd6c1850d08eea8421660ad52b5a2a5316717178f210a8a206cbd7bca4
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 10156 bytes
SHA-256: 408925c93a243e6e89c7fc47cc1ab350d05f61adebc74a62792fbae4a17c8f86
font_02_sfnt_off000122ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1