Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d49a560bf3d685…

MALICIOUS

PDF

89.6 KB Created: 2021-07-17 05:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 28c231ad9035ab373e6e299bb3bc448f SHA-1: 06f575a81ff4cc7be9eba133988217481797cf66 SHA-256: f9d49a560bf3d6853b4290e35958d82608f37aa6c3e272d22a55ff6f07aedd76
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics indicate.

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 https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9353bb060af22eaa04fd302cb06a42fb/54489033952.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713253e49a8---17196437641.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417295a741---wubakuxeduguluse.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6f1a9a4107fcd455342633864662d78e/54109233156.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e83c84fbb3fa051b331952ac0a7b4952/xolebujuvisanopofela.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/rajogunokezedifowoz.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1c247ade29297a65edff5aa4e54d7838/faxegigir.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c201ee5ad---tutimozaposuzawutabibin.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/27255970703.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/39654648681.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/zibatezozaxopuxilavawixe.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1a3466ac---85496018368.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/18287adab05db03eab597d811ee9eca5/vazirakeji.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4e51619c8f563cf1d2319742dc912386/27453654865.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/6ib3ba0mprdhpnmtrd1gv65fb1/lumotupowovibubodoz.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/p6ic7tl8b3fkig15psra9ohhh4/36989283560.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/81765185463.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/kegobuxowigativunaditedu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a6fpembu2peh92b8ck28usua32/lapaxifusilokira.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/jolasite.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c46c3c54fcc3e2657ecf108aa4e8f23c/siduno.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/s4fo8a9ad9enrfqi7b5gfacobl/mexofefuruzakuzuvajejofa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c8972707e4097871c8141f18ddf35ade/botidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=baby+hiccups+in+sleepPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 10560 bytes
SHA-256: f203e56dfe46588e767948a7b118bef2ca8ff029c514df74ae62e72f5c988b71
font_01_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 17028 bytes
SHA-256: dd3319e81a0072114a983e2ac69096fa302943ff208c4955366217438f4ee666
font_02_sfnt_off0001418a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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