Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19af4479af13162…

MALICIOUS

PDF

93.0 KB Created: 2021-06-28 23:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd413822c378f968ed09f9eb5ae19132 SHA-1: 69faa3145e7b5b3062e7db9e327d9cf16a4077ce SHA-256: f19af4479af131621b13fedb0264c16133073c6dd802d2c0b11e926af3d483a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites hosting PDF files. These links likely serve to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b1e6c98b---gomuv.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvk6dj7ehjeq4uut2e2ljfsge0/38374962197.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/85597311587.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e531bc8a07---5928400629.pdf
    • https://aldurra.ly/images-editeur/img/file/vupej.pdf
    • http://polymer-optix.de/userfiles/file/botax.pdf
    • https://cleaner.pl/userfiles/file/44287114997.pdf
    • http://advicetao.eu/pictures/file/puropejamazam.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1410c330449f0130d1a1541f92269370/68345220079.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/136b2cb7e1797e2b911b6ff86b670f71/xakojewigovemi.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2b9095f23---powalemujukaxenowaki.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b54f023c4---63866149188.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8d4c59e3---sebokijinemasiketif.pdf
    • http://andrelandberg.com/userfiles/file/zufapevibuzijedajamama.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/22554644024.pdf
    • https://a2designbg.com/userfiles/file/donewupud.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d22234d1---kaxarule.pdf
    • http://autohondl.cz/userfiles/file/nanivelejujurometatili.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc02cc711---71067691616.pdf
    • https://mauspro.net/upload/files/burotofilinalobamopezin.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae83cbeedf1---3726223815.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0pgbbgtjps61ia40iembhifr4u/subatakubizu.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58930850320.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2747dfb53f5cf1003ddd398fc34181a1/52361981229.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=total+tax+burden+by+state
    • 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_off0001084c.bin
afca125004d3adbcc7649286198decdaaf7a8acab31893890dc0be2bb31c389f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 10568 bytes
font_01_sfnt_off000120a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
font_02_sfnt_off000138b5.bin
7d91ca54dfc68be49f44b6d8e3aa2d53d1a63f7aa39bb9b533a467223c475694
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B5 17228 bytes