Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a04f3b530c6b2a…

MALICIOUS

PDF

95.5 KB Created: 2021-06-29 12:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5989360b71cc758bb9051aa8b7885b2c SHA-1: dfa73ce9178d57c9536e4b12cb772d29968d138f SHA-256: f2a04f3b530c6b2a36a6c4bc7f38a916d1a6c6bac8c3d65992b66a573058440c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and serve other PDFs. This behavior is indicative of a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/30be9ef843ab8733f4018f18dd3d2989/kukake.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/7d269a3aca932d228855f2673d2d04b4/62837351250.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b7c2ada5---lejakeviwutit.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c48e1421d9c---47558511716.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/83425620352.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/61e317992a819de954d72f53c162508b/tixikujogunopov.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2ac0a691b6e8e1abe71d7f2051b6111f/8476438336.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/153927fc9c53e0dd0c1fde4d3170c69e/63125576880.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b86fd70c27060d06c90c3742fe82097e/49918818381.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/375c275f89d716463a700e674fd169a8/87678980461.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc17102a03---rolukumavame.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cf793d3b4820725c97cc6924b9d46b35/71457497847.pdf
    • http://gianniarnaudo.com/userfiles/files/26429993789.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1204863fc9---32987604983.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee273059d8---xadizusegufivefunifim.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8bk3p4ih4qtfs3cthpor922jt4/47122872375.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75f218e621---lavekarituzex.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/rumadi.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/6b6c27124b2e6840d42aa381d1f017b9/deferotesusizalujigupejes.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/c9nuk327ddm0f5unimdrlmgtan/giwudesomu.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfce3890c---faxojugepikibanurez.pdf
    • http://vidol.nl/userfiles/file/vexonobukoxu.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9ced45b9---83292841751.pdf
    • http://bindashnews.com/userfiles/file/60604147847.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/eff5fe127717bbb0b41e80f258055474/nokidurezap.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adadab01e62---92194098008.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae99be2f9---76620666217.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cto+chief+technology
    • 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_off00011335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 16792 bytes
font_01_sfnt_off00012b4c.bin
df475cac1243816777377f956a3af294ecd75d36aeb2d6e65744924cbce5a59d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 10332 bytes
font_02_sfnt_off0001428f.bin
5d892b7f8e3ef638b71cfe3df325bf4f62f1aa5411fa564802fb36b29fe4f726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 18768 bytes

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