Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c762a30d4e5a5b…

MALICIOUS

PDF

82.8 KB Created: 2021-06-30 21:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7885edf4a0ad7fb0863150b7c9327573 SHA-1: d13eab9eecfa048e4204ea735f51c42f4fd8fab2 SHA-256: 70c762a30d4e5a5b475d3c5cc2fe7ed5635c67abb584e051985768c77548a19c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=wheaten+cairn+terrier+puppies+for+sale
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ab6d43605ddab80be97bb55bc62cd238/20291597672.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/98cee47bf82b06a4ba99dfbadc307eb2/16215535540.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d761113431---75806534321.pdf
    • https://by-express.com/upfiles/editor/files/31694881120.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09c808858c---56242967567.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ql7akp8te1u0hnlr0opv5vjp9d/xoxasexededelabido.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8361a666e---vabizozumon.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dadf0d50d---vidoda.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc244f74521---98845772430.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af649c4536---dekibisalikigujefegisilal.pdf
    • https://m3csrl.com/file/kewigenuka.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b56347d0a09---fazixepi.pdf
    • http://mackyz7automotive.com/js/upload/files/22942893578.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9150ede25---pukatomurafavazedegov.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb39dbf523---kokikobonede.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/602j21ud6c3pvja38q9hjsir91/fezetifufuwiwarizar.pdf
    • http://arunimaflavours.com/userfiles/file/fitakotuzeta.pdf
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/nepizamev.pdf
    • https://gachbinhduong.com/upload/file/99902428619.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c8cc6a1a604ec49d174389f62f2b8af1/sogajezuzijupo.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/6e561e520a76f9b3929002001a1edc60/powebaxixumo.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d35b0f3d7---6719021241.pdf
    • http://nhuaduongnhapkhauaz.com/upload/files/4321516953.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/vovuze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBD 16792 bytes
font_01_sfnt_off0000f7d4.bin
67880a009f43db806f188a89d972d0fbfeedd75f436488ae1cf4e55655b02a80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 10668 bytes
font_02_sfnt_off00011035.bin
df50336426dbc33d6e95125ae90010537390b830cebdef8bdb885df552bb4fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 17492 bytes