Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb47714323e3f273…

MALICIOUS

PDF

55.3 KB Created: 2021-09-05 05:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 831a7f504c725b54423216c799725207 SHA-1: c928745a9d156ee0a4eb82ad5e388236b1795617 SHA-256: eb47714323e3f273ebfe2753fad5af4b37c64ede6da56e2c5480dbf2186a2269
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or phishing. No specific family was identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8977

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=unit+rate+worksheet+8th+grade PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b7ebc2e---52180500428.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/83145694939.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108251935121544.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/47396901865.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/e3jbh2mamnnb9kns1ekc51r052/wamujedukovojo.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/48133625717.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gigesufadowimipojazo.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210902230759.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080db2941d64---rimugerozuvomiwifobim.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/88737992107.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/38645980748.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/ravomogiwezoxofobuxoli.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/48900517259.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/47a1122433d9180d06d16441f12eeb02/41695645928.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/fapifudukakusuv.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/goximef.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e63856f1001---48286492227.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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