Malicious PDF — malware analysis report

Static analysis result for SHA-256 240cf67fe7b97fb8…

MALICIOUS

PDF

95.1 KB Created: 2021-07-28 13:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b54110031aaad10f1e28736be24e0b30 SHA-1: 195b9b1426a01841be1463948a3db48d8692d283 SHA-256: 240cf67fe7b97fb810e21010c44e0538bb65c240c5d5a3d1a1d0416b10ae266e
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 compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of numerous links to potentially malicious PDFs on compromised domains is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ed2630ef8307be38b6cc9b32c97a25bb/rinufarilulujirovedekov.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/73e98bfe00308dd411ddfd0b0213dd35/bisitezex.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/014e2b7d87396dcd217da4552164628a/rufodokitolezazoxipife.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf697c500b---47990590776.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fdbbdac1e---51000351613.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xasaji.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://cbcom.fr/ressource/site-image/files/ruvel.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617cad6b45---pesevilodopi.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2fb5ba3b---75342739627.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fhrnfnucse39jo0f53s78l9du5/nujomiloko.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4f32b229ccad1f08a394a10a1345d9d9/44570379153.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/59771635137.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/73840333241.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/9828187235.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/18027534046.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/96557057838.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a21db70562ee16cbb612740a36c99f4b/momukirokebozezedo.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/kipumemiwiguni.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/65315984805.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e090fa3a73---82220231143.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7a8b1e3f---dogumop.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094f7f368aab---lemumumut.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c4u6phrhfrej77esugu5joec7a/vejor.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c9c78718---nalepobuwapuku.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609594bece5cb---tobefuzikagun.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/81096198714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=prentice+hall+geometry+cumulative+review+chapters+1-7+answersPDF 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_off00010bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCE 17784 bytes
SHA-256: 21861d75f18a9aa9664bc80fa35ffcf78a997d39ed244cebc829699f7cf6c85c
font_01_sfnt_off00013a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9B 11324 bytes
SHA-256: ff1a0c756de456cc52d7e8070c0d227a519cc7a09982e7b83f30576df21ff853
font_02_sfnt_off0001554b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1