Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f8da491d7122d3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 04:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91198eb574b93d073b2eeecddbe527a8 SHA-1: e94181b72adedf4a98f4fc0b568fe3ee5e9ad935 SHA-256: 28f8da491d7122d35206b1a4b683fcca9770aaf60b6c51e979afe2713753223d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.weilandensemble.nl/ckfinder/userfiles/files/zesirudipejuz.pdf In PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sulubi.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divinugakibuximebimonox.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/79620275086.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142b8881db77---kalezexeva.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/titizerodebepaf.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/jebufizefog.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/28020906688.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/4344768275.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/98646520583.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/siwilanovegasopuxi.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/77a727c3d7cee434aa1bc3ad8404dc72/28557572846.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131274ba467c---nexupewebomanuwosira.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161465100dfe24---21735765555.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ad2dddab7df3cfcc9a4ddced8d10f1cb/40000382899.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/pugagesazolivan.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/5100661910.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/69816819825.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/jixeregidada.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/84403156314.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/joruboko.pdfIn PDF document text
    • http://insei.eu/userfiles/files/80410792.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/60153323543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fifa+20+apk+mod+downloadPDF 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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 16932 bytes
SHA-256: 5ad124114e88d28331d8ce0b3f7b250442433da6f7149953c74fe21679d92106
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 10560 bytes
SHA-256: fd176181117d875abbb3ef8b1ca982eddee87c9c135fc14e251808a75cc42281
font_02_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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