Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e51872770b91a0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 01:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd7f22db2a63c60b29afe71acd4143c2 SHA-1: 889a70d5b12c53c0a45a610ada61137a00b5543d SHA-256: 10e51872770b91a00014370066cea0c9ef6077704b430cfd5dd67965be367365
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://catamma.ru/uplcv?utm_term=darkness+rises+mod+apk+unlimited+money+and+gems PDF link annotation
    • https://nestsearch.in/admin/uploads/file/jobulagegelabasa.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf92b948815---87547211487.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801bddd6fdc---bugegazigogevadelig.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ffc1d032d---13159263034.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/tuxinesizalasepokevekus.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fda62ee3---67825154796.pdfIn PDF document text
    • http://szpk.hu/_user/file/poxotegiz.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/gipepexawo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed01bacbe---70534172821.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120abf9224d2---vogakuladeduwumavasukidex.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bde592d7cbe---zejudenaj.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/38753473831.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ebe87c5aa1620666e55e8c0a75442080/tijavinabopunilukopa.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f5328200---vokinoridifivad.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/vupixutixusog.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/bofesekomagebagat.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/fopijuxuful.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mawajuvi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee77013c6a4---54484193200.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612361fd55f25---bekepozuzevixol.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/dunirufenig.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/65243493641.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zogininusulu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/88266331704.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 17652 bytes
SHA-256: b1f7cd474ef90f932abba66a97de8f9e6901ccb7585593a0f82a899364e8f6a1
font_02_sfnt_off00011cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAD 11040 bytes
SHA-256: 05db4be84605ae95f9db4e5cc245f5bf1de9a3a5ef7c06299a0c9da191268da6

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