Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a2806baacfc633…

MALICIOUS

PDF

99.8 KB Created: 2021-08-10 16:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bf37c338be921c53bc579eb98834811e SHA-1: bc8345b4a44b16b7e8dd261de67baab0b25b5179 SHA-256: f9a2806baacfc6332fa3c952daa941f78a1c178eb38cffe8b2e7ed75bf5a581c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The 'Password-protected archive handoff' heuristic indicates a common tactic to bypass gateway security by instructing the user to obtain a password for a separate, likely malicious, archive. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9629

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=solidworks+2014+manual+pdf PDF link annotation
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/83129688308.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/jamulibeku.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/3252239432.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/91309582645.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093b720ed14a---bijevajanerinofunezimize.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/27486297551.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60ede918db---24789768037.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/tumagekijemezitizibirurex.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/wegenimumuwuxulido.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d95698d54598e803698f48be40cb80db/sugobowalera.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jotetorewuxelepowonelajoj.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6e4a0e04---zudizelana.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7dce9540---nobebonotikemezivobawar.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/99755024843.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/41af8e7fba0ae8d03bf3ae25c95b8aa3/pijejemi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad78c469f4---madinovalosefo.pdfIn PDF document text
    • https://autoparkalbanese.it/file/jivodunafijasuze.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/gnkfha40nnk1dse3tej87o6tb6/17571054416.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/36824169415.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/49039d8dcddc3e33822873359ebd7210/rivolorikoxibon.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d6164cc8---sefuvuxudu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/67962964972.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b0cc7eaf---tuzaderomelififedavejatim.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7fd61550ab43f100c16a8428cdb83806/kavapamukibuxumadoturew.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/29397893909.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/rekejolarelumofesox.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_01_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 18540 bytes
SHA-256: 8011e6d6fbfde711434b8f23db9afb77d56ed64f68d46d04df0937c237b13ca6
font_03_sfnt_off00016573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16573 11152 bytes
SHA-256: 66e6628e85f3ea224e418043da37984a9e9977aaba74864c46b401c60e7fc150

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