Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9eeb1d0582a972…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 07:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48ab9b93d7eda86185e7c119be88ff45 SHA-1: 6b311c6630a1aa436d3b37bf2009d442773d6cc9 SHA-256: 6b9eeb1d0582a972dc84545bad437acd8e50fa381c198685ea224d28980afabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of directing users to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=anticipated+graduation+date+meaning PDF link annotation
    • http://www.tahi.hu/ckfinder/userfiles/files/jawulavo.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210812_110649.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/sunarakezenuwuta.pdfIn PDF document text
    • http://kleiberit.ru/files/file/65112704847.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed7f461d89---30167301559.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/zakoz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ordf3uofbp7q0tpji2pm1v7cr7/benagabusifovobide.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081595d3e26d---jiradijobe.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/nizegexorisaxofanubipo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65cee62300---movekax.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160881ce9c1049---waxizitupapexisod.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/fudidubefulupevogu.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/85586971380.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/4754084413.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/japunogudedojuruvomip.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/14511759272.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/kubub.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/vufelutiwalebabezukuluz.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/monifejediza.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/87195598460.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/50621652585.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/0iqv42f6lsd34da57jf9aa8mpi/fejovirapezil.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/filajo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8749fc693b---60353111816.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/22172065073.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_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 18572 bytes
SHA-256: 9d262688ae60cb17fde2ab059bd0bd594a1640d3b65d91d518f7939b8337688c
font_02_sfnt_off00014692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14692 10724 bytes
SHA-256: 31ac340f740ee1e22c5c7f6328efdc85a99690d582987d35d97b2ec1f1542e50

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