Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5c8de47e69b6ca…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 21:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54869f03e55808b3f4634b2fc8cde7ef SHA-1: 052e9c138efb2e06154a8d078afa05b3bc31abb0 SHA-256: 8b5c8de47e69b6ca0c5d7ce408d3afd4f59aeb1320912c4d90f2c8bae92567d2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple links, including those hosted on WordPress upload storage, suggests an attempt to distribute phishing content or redirect users to malicious sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=automatic+time+zone+wrong+android
    • http://mybyblos.com/userfiles/file/bijudolep.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b515dc1eb0---zagufekamilelirawufov.pdf
    • http://hilimall.ae/uploads/files/wunitirinize.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-9-2/20210902022716492031.pdf
    • https://deltaguvenlik.net/userfiles/file/ruzatakavixigef.pdf
    • https://bawauang.com/contents/files/85424763453.pdf
    • https://ikomsolutions.com/admin/userfiles/file/74524231132.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b28893e3---kotalupoweguwo.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614975fc5be2c---30826003042.pdf
    • https://webhosting4.net/media/file/disowotomo.pdf
    • http://yangpupark.com/uploadfile/files/5230009943.pdf
    • http://kledingindex.nl/images/uploads/46049345823.pdf
    • http://ongxoanhdpe.vn/upload/files/83412376517.pdf
    • https://loyalangkorapartment.com/userfiles/file/76749627928.pdf
    • https://cottingham-group.com/cufiles/files/22419944131.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149039e5a5e6---jiwigusijaliwugewukejuja.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161320b93c5a00---luwiwivukel.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/38631281366.pdf
    • https://ifbscalidad.eus/files/galeria/files/gesabipevediwofonedaji.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/rotuba.pdf
    • http://kengosushionlineorder.com/uploads/files/nureraxivida.pdf
    • https://kaskad-74.ru/images/uploads/46108162257.pdf
    • http://kcemsp.org/upload/editor/file/jegikokoxeseniror.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e402.bin
d419baed8691461275b05e1af483a7fb28e0e47d2140fc95cee2cd8c7c127210
pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 17768 bytes
font_01_sfnt_off00011273.bin
1c5bf6c8eb10d34cef25fe32378ab9a0c1608e4324623baab07fb2f31b5c31e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 10724 bytes
font_02_sfnt_off00012aff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes