Malicious PDF — malware analysis report

Static analysis result for SHA-256 097003ef6a4cea9e…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 10:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f256204d01cf7ac97e232c3510327209 SHA-1: 3dc44d6000bca0743999b6111fab007647454289 SHA-256: 097003ef6a4cea9ec32f72f54ff58fab041e7f34fc24f2085e18de13e918df02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, which is indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=hotspot+shield+for+android+full+version+free+download
    • http://busankid.com/webfiles/board/file///43138462514.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/38f1958hnl9qa555o1mm7vhe8s/85993489465.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/11549738084.pdf
    • http://hk-sai.com/ckfinder/userfiles/files/nuxegoxoxonolekibamulu.pdf
    • http://uitetenindex.nl/images/uploads/46452195765.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330427dcb79---jokir.pdf
    • http://mrhobbscoffee.com/images/uploads/file/vuzepaperowete.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb70af2aa9---75242017936.pdf
    • http://sartor.ru/upload/files/42355845939.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/pedimeji.pdf
    • https://maggievanostrand.com/uploads/media/file/lizofubadubigotebuxunekol.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/butemebupapet.pdf
    • http://www.vegagastro.pl/upload/file/pederewosojirufewapozew.pdf
    • http://dastone.ru/userfiles/file/ladigonujadewamef.pdf
    • https://tonerihned.cz/userfiles/file/51555996484.pdf
    • https://cian.hr/userfiles/file/junegifexunakoluga.pdf
    • http://adatarimhayvancilik.com/Images/Media/files/getisurukuxodogomap.pdf
    • http://classtool.info/upload/files/xoreregejavuxu.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/xapedewek.pdf
    • https://takitech.hu/userfiles/file/12502397494.pdf
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/pojegil.pdf
    • https://towa-aaa.jp/userfiles/file/42057244127.pdf
    • http://parzenica-bialka.pl/userfiles/files/powenefeduzozawet.pdf
    • http://autoscuolecasetta.it/userfiles/files/rezupopubunoborajo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b778.bin
a9cf7c8fc5b7555e2bf5531da7aac6197ddb7335fec99331c61a878059e53d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB778 10836 bytes
font_01_sfnt_off0000d06b.bin
4a0318aa790998860960141afee315cb4216ae5e9b3bf2f4fad9c649dc8eac4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 16832 bytes
font_02_sfnt_off0000fb11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 16792 bytes

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