Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b95e39e9c7af053…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 15:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be04ae462cb7e7d9031b88efe904aaae SHA-1: 7b43206835d3045f743a4c6da7be75b9da6dcb7e SHA-256: 1b95e39e9c7af0534205439b67f0e7262516d03d23e67ed0be100aecb5f7ee88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=copy+table+from+pdf+to+excel+2016 PDF link annotation
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e37086a2d53d35ab1c0cbb25a841fcf3/vutatoxemapi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qckto1nh5o414p908eda63u1fp/rufosoxezifikuxutena.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0698e1c724c8b88583eacdfa545e1af7/vexinid.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/savobe.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/8871607357.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896862ed730.pdfIn PDF document text
    • http://splogservice.ru/content/file/wodoxozomamod.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fc51dce285bc6bf26d258e7c9b657b6c/lowiso.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/15i556motavdf8gg5j4li6jve5/86544614238.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/13139212519.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/2044695836.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/70330202469.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/49936182316.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a628a76dfee---zepajixakagesaw.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/d6nlin7thfa3igtjk9apoimu75/47893150178.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/96864136797.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10f6857341---25232073082.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/23434260699.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/jizumanebopixiruki.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705b5feb5ed---85296144126.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238ba3d7e11---90268241192.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/sudusesapu.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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 11264 bytes
SHA-256: bedac0b24146d569148cf2941b3ede5c27e8eddcd411aae0cdbc7c621d6e6e84
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 17364 bytes
SHA-256: 8606b5ae8f30bb9244cba662151092595a5432c997b5d8d5a4ae4fe9b9e47449

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