Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0232befebb28f9a…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 17:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75c8a6f7cadd0567c9a3ce501c5afdab SHA-1: 43a2567f6b1bb2fe6bc71d611594c938a0a205e3 SHA-256: d0232befebb28f9a2a3c5cae0c660656377f7d97cd10b00585b5f637c26f3362
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, likely to trick users into downloading a secondary payload. The presence of a 'download button' heuristic further supports this phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://azseal.net/uploads/userfiles/file/gesepebegasunogaged.pdf
    • http://sarkar.ie/userfiles/file/32069795096.pdf
    • http://clean-ecology.com/Upload/files/37481342647.pdf
    • http://asja.ua/userfiles/file/demamejafivagor.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/62ea7d170c77a3bd1f018fb7243e62a2/91792828083.pdf
    • http://uhorder.com/upload/files/pubenod.pdf
    • http://studiotecnicofrisoli.com/userfiles/files/63088888059.pdf
    • http://dralituncer.com/userfiles/file/34997220439.pdf
    • http://sys-svinding.dk/userfiles/file/regokifaporefelidiwamimux.pdf
    • http://dekobonner.de/userfiles/file/xobugedaf.pdf
    • http://uekekb.ru/!upload/files/zebidolopimedikatijorupeg.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/26273973720.pdf
    • http://seritour.com/rsm/files/50279378996.pdf
    • http://likuidart.com/files/ckeditor/files/19232818577.pdf
    • http://lawngo.net/fckfiles/81840143720.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161322412089d0---26335535354.pdf
    • https://saatyapi.com/upload/ckfinder/files/xosegekekofekoluz.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/matelenekukunewujeko.pdf
    • https://villatoscana-pi.it/userfiles/file/79466273792.pdf
    • http://sosnovgeo.ru/userfiles/file/7680768338.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d3167ab90cfb4b1d0a95022eafb7dd0e/16322617595.pdf
    • http://cafesezony.ru/fck_editor_files/files/muvavuzufope.pdf
    • http://paradisoseminatrici.it/userfiles/files/87049832292.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=offroad+outlaws+mod+apk+free+shopping
    • 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_off0000c4d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 16792 bytes
font_01_sfnt_off0000dce7.bin
d9332832c4acfdc40a342671c3351814fe29ea82293afe0c762f66684dd950f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 11248 bytes
font_02_sfnt_off0000f6ee.bin
4b412a22fcbd443158adcd7648ae9007cc9f19df7f234eceee79801cd3279fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EE 20956 bytes

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