Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7bfbb56d6f02e2…

MALICIOUS

PDF

88.2 KB Created: 2021-08-05 19:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9059dc735d72a8fe5d75d58e353a9f9f SHA-1: 367c780fd01d527fdc7e660b277550374ff879a1 SHA-256: 9d7bfbb56d6f02e26a3a2c3daec7f4659fb05bed3fb67d37520c9ea69d9ed103
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS upload storage. No scripts were extracted, but the primary attack pattern involves directing users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://krisoc.ru/uplcv?utm_term=how+do+i+use+a+victsing+bluetooth+fm+transmitter PDF link annotation
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/639c5a73f4ade66ea13ea6dea40a99a2/33395132484.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rs1kfh4l21arrle78uopjlnkrc/29887288420.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8e045750---xaxexowemaxasojejigiwem.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/titimuvafosizeb.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nq30d20lu2skdi2ksl8h9qe57r/gaginorusilereninagemetob.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/surosogisikefap.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/65638649786.pdfIn PDF document text
    • http://licausi.it/userfiles/files/lekipobelezato.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea6b7ac6c---52637250840.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/08d6fe7895527212aab84ba2c64a74ff/76677570919.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/55448574127.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a579ed3eccf---41005600504.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/zogexaginifefewenovuk.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/29939336965.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607187d899828---kitofukaxowekadagefap.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/437573cdeef2f6d5adb69ff318389208/mexopixafulegonude.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/97401249776.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece00c7ffe---59144572269.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f108d282ad---53458048636.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/48837248868.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/36071827214.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/78740dd23779fcf9379d28e8648edb62/564124084.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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 11308 bytes
SHA-256: c03f9e60bdd4df8d560310cd7ee3fb0b15b51b767f415640a7571820ebe6e536
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 17932 bytes
SHA-256: 43694976757495c6eb02dfdf17f8203b016c3a2636243dd8fc4ecc2ea1f282b6

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