Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f6853ed4572498…

MALICIOUS

PDF

426.2 KB Created: 2021-07-29 20:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a667bfbd083aef10989bf4b0fe497b6d SHA-1: 9c853cb50798317509e5103daa7409ee0a913a37 SHA-256: c1f6853ed457249864a3d670b4d6221d4528ab050f1f0507cbfb4239d2ea7861
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external URLs, many hosted on compromised WordPress sites, which likely serve as lures for further malicious downloads. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7373

Heuristics 5

  • 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.
  • 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 http://tafgambiatours.com/userfiles/file/tosapoduzuwinezijur.pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/oqts6c1dkdhpo9ld18ruhpk4e3/43110215017.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/325eb475ed89487644518a785162192d/45289632313.pdfIn PDF document text
    • http://skupka23.ru/upload/m/bemesigijogujusax.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/35494045669.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/gifarukemukisimipudilaj.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fd09d049---vibowimudufadix.pdfIn PDF document text
    • http://polkovnik.su/upload/file/22890380291.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfbcc926f---gaxatenokidivitovezid.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/22457068064.pdfIn PDF document text
    • http://dzbnf.com/upload/file///balewimisomale.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160893a9882cbb---dumigivavezedonuxisa.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/lokisizitajerixalububoro.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/o1lrk4ptr5q5e55kknil7io6h6/67140561674.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d4e6b7853952e7603fc4979d9509c13a/gimop.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/refudezi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f75736f6182787dfc1fa4bf0bdeb4176/lunusowutogulaworilubofox.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c8c4d1942---73011299943.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/12726051568.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5ee17ccef---jemedejaroburobazim.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/66357112226.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/wasaxijegenokabewizujazum.pdfIn PDF document text
    • http://pr-dienst.ch/file/golafuxanananud.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/24fd4ed330b8533155934b9d69a8f04b/76419506588.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/89624012714.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_off00062882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62882 22164 bytes
SHA-256: ac3de87829bde9502aa86d9cd40757b7bc52b2731dc8c1850f18839445a245ab
font_01_sfnt_off0006623d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6623D 11356 bytes
SHA-256: 03d899054efd991192f4f127e536547d0ba060ecef6569615b525b94e487a7ec
font_02_sfnt_off00067cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1