Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d91801f2bf38cf…

MALICIOUS

PDF

105.4 KB Created: 2021-06-29 18:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9abdfd7eb9a7624129d0d03f26fb243f SHA-1: 6a8838685a7500f635f42b9185ddcb11f1eb648b SHA-256: b6d91801f2bf38cff85965e46aaf68d239e5328b303151bf75cfa0e30bb345e4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/bt00s7hlgmluk97m88n3ikvs66/kanavoxidolilenudamuwel.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8cc3d44ea09a8caf51d81ea09af4cde0/fezawezukurovidofufusigu.pdfIn PDF document text
    • https://aashianarealty.com/file/56574154873.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeba74c5a3---13462708419.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vbj6v2karpjlnu6k8mdqffl617/55516662679.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/484ce57debb00c8347008cd15053d3b5/74183614691.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607588bb03c46---75673301350.pdfIn PDF document text
    • https://aedwea.com/upload/foto/91235324310.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lfqehs44hr5pcimugu3510tnoo/nasudon.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/mepetuf.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087847631774---74315922260.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27e027f39---poseridoxezaza.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d5d84c669cab3c82e7fb3d9723c85ebc/65889617859.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/xoputetemevux.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/74635925682.pdfIn PDF document text
    • https://jagominum.com/contents//files/47207611076.pdfIn PDF document text
    • http://lyshiying.com/d/files/dabojidowa.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dkv023672jbre4b4ncb7imlk60/wusamukudogixopetekip.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf67897dbf---84749297727.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/xevuba.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/21936912103.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/89265778437.pdfIn PDF document text
    • http://naucseto.cz/storage/28021330255.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/23348851213.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3fde49475b8fcdd0b1fea42e27c591a7/nifusekelokarawipuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=boo+and+hiss+crossword+cluePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 2744 bytes
SHA-256: 064a652138ba04475aecf9d3e63d292ede40fe589793fde87a201959962d34f6
font_01_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8F 21048 bytes
SHA-256: 7955d490414e9c2a0f20b1c12c0811b5392fd35706d702eafa71ab2e2f2369f4
font_03_sfnt_off00017f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F78 10608 bytes
SHA-256: 74429c64021686c23fcf47a90cf970ab94f8dea19079dfca5b8b4fc3b50f570c