Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb379af04327f51…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 13:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 553b979b9e3d4a42dbaef9f1cbcdb965 SHA-1: 399af526a91b90ffaec3b5b302785a05b4558ac0 SHA-256: 0cb379af04327f51789b57388efc3f7f250443d2005828ecada2f2d94922a8e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The embedded JavaScript likely facilitates the redirection to these external URLs, which are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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 http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16092112fedf0a---lutonupurimusane.pdf In PDF document text
    • http://marcth.pl/media/fck/file/wonilegorix.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/wijedewedujotatiba.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/37192532192.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/moxedigoretajim.pdfIn PDF document text
    • http://isvpro.com/custom/files/49325085483.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3f88bf4f7a1ce47c4c8e994ac6709cf2/14599729718.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2efef165124e5cb7eb7a92f61825f23c/21995353386.pdfIn PDF document text
    • http://lukinserv.hu/file/18330915744.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/kukepilidato.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/wofamawexamapatafuxuwos.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wulisefoxavuwefimumakela.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/batanugidadabofomu.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/defera.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/murizodasikuxe.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/47188555762.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/77d61fa3fdcfbbdb71800f7f4e320726/nalowojosukipiju.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1723ba9c5d---kazuporenepujat.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a401507e---pafoxafifagedubatinek.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/zigofawenewibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=let+her+go+piano+notes+pdfPDF 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_off0000c744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC744 10688 bytes
SHA-256: fed00b9cfd9337cf1f6c065a3eeab716aa82b8b78d8c185778a7d9d55fe05cbe
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 17284 bytes
SHA-256: ecb7ffba34878779c66ee8b0eb793f5b641561528f52d675e5aaeb5a0b23fc63
font_02_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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