Malicious PDF — malware analysis report

Static analysis result for SHA-256 9324aa2d74b8e565…

MALICIOUS

PDF

90.0 KB Created: 2021-09-04 02:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e84b85bb837b43822d4c769678cbeb02 SHA-1: df2190f26e8d113420a0a58ac0121bc606c9b519 SHA-256: 9324aa2d74b8e565286d339a0144b41af02f277fa9f637e24b404b9edcd0b3ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3d8104fe---53827596310.pdf In PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61d9f083b---22738919816.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/selijuzeluw.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/53152293270.pdfIn PDF document text
    • https://cmf8.ir/data/file/90116437002.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/pazomabibela.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/goseledekisela.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161101757a5ca0---54757766585.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/49852889610.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/41453944244.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/rizibirukogevodabopolebum.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/vexurubuvupogivug.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/silodapefoporuwedituz.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zotobefevome.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec85520d2---viwajagosaj.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074509990563---32281166469.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e0814602e---50768681089.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/92773672079.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/27a644683e575b16bd75c0c3fe16a59d/rarobeviku.pdfIn PDF document text
    • http://schubert-hh.de/image/file/76606828938.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/dejogenigifodizokon.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/gagaropikonubel.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/jufibewalitodenewixomebev.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/snmv8421bvoq8jldq7tqk6tt5a/54106232458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=situacion+de+la+porcicultura+en+mexico+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_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10892 bytes
SHA-256: d3da9d6f5062df2db05583971ba7eb4205b91f244c4becd6419af05211641589
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 20180 bytes
SHA-256: 0eac9e597eba42cdd157e5ad9ddb9429413cdb54b2060ae9709b76840c4d8ff3