Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a0e6faca658602…

MALICIOUS

PDF

88.8 KB Created: 2021-09-20 13:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b6f31a66b1170f41dbabff8e0dc4d3f SHA-1: 1704e04210adee0167f7915796bce8e5fd98b545 SHA-256: 45a0e6faca658602e1ff7e030b371804b569450d28aad098153d2b6b152edff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads. These links form a link farm, suggesting the primary purpose is to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=gta+game+keyboard PDF link annotation
    • http://princeverma.in/uploads/files/zexibiwodowukewapiw.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fubax.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147b61f89982---dunopexepekudatakodot.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fef369c01cef9c380d82ce671c1da55f/buxibuwipofu.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/47591018850.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/91b1d95c150c57d06169e8c0495a8635/12866047937.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/fakidinebad.pdfIn PDF document text
    • http://packturf.fr/files/9451470613.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/mawuruvisotoxuradobujot.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c3ef8d06b---24807443241.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/81879320940.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/69829820241.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/19575459583.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/41296051317.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631963573.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109181219503705.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202196131532210.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/49316990469.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/96514505724.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/kidetidagijetosedetuzijif.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/83451155343.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161301d0762088---zomefutoxoduzitufazo.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/tironafatu.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/91877363555.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_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 18244 bytes
SHA-256: 5fb0883c2d9f97077db103d3d739dca9cd4a39a1985a29134e031e2b96be4171
font_01_sfnt_off000125e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 10568 bytes
SHA-256: 7e39d7f66f328d15720bb8c467b3fd44a40496871fff88f63fab8a479f214143
font_02_sfnt_off00013de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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