Malicious PDF — malware analysis report

Static analysis result for SHA-256 be321fb543f39303…

MALICIOUS

PDF

73.5 KB Created: 2021-10-12 16:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 19a2d070373adddcd589c89e03e15e73 SHA-1: 85fb60846e1f052b81e4a0a4949f0456a3f7acd0 SHA-256: be321fb543f3930365d4369979b75b4451dc9524af0d9777e6532a2d7e4322ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The 'SE_INVOICE_LURE' heuristic suggests a pretext for user interaction, while the ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the heuristics suggest the PDF is used to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://infrive.ru/uplcv?utm_term=class+9+computer+chapter+1+computer+system+notes PDF link annotation
    • http://kielcenoca.pl/files/file/lativikitewipinuvegules.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/tefogo.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/javotajarotogepadijikusi.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/dumosumenerunilizer.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/28468921296.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/28650148440.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/694025690.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kupade.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/28164367587.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/betajigo.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/tedob.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/daxuritetuxo.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/2689588226.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/78bd878f6b6e2642c4f58636e14ff31c/40274002869.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109230830017210.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/25480560047.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021919141016577.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/12998922107.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/30863722910.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613854e779c7c---61300180336.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/furiwitaperijazoxopaxuwaf.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/22650605611.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/16140769650.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d826326ad0---11563687811.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_off0000bc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 11012 bytes
SHA-256: bdbbc3490e850c9b8056b54678c33fda3d0cf184c854c28818134d6c3f730d82
font_02_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 16448 bytes
SHA-256: 40bf4f4bc6e59c36c76deebce86374abc265f1aab3027bbaf291738b495a3781

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