Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f62d0ddee3d370…

MALICIOUS

PDF

91.6 KB Created: 2021-06-25 14:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 774263eeaf5e7ffff075a1fdf62af9ac SHA-1: 028e2adbc6fc97542a6de1e9b7c1291b4639444a SHA-256: c3f62d0ddee3d3709dcf5a7d89bc81aed0c61e8ac8a27245bd0aa792d3408192
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707aa26b87b---44314366600.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b990d2a238b---pevumuvawewekigovegasofol.pdf
    • https://bookatowncar.com/userfiles/file/83654529816.pdf
    • http://charivne.info/images/file/wufugoneboximiximaletalap.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff3d363c53---wedemutenufepisa.pdf
    • https://ikincielinmak.com/upload/ckfinder/files/zanajagotigasaniwiz.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69017e7318---12691070691.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16087e453892fe---rukesoxakulilex.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/84250908926.pdf
    • http://llux.vn/uploads/files/3689523965.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160898662c3c7f---84328623118.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee84675209---mejiraxanur.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/50122d86f1a738c9efb1c23f01e6a01f/goxexixuxakoremisigewe.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/99fbec6e94563b7f3f22913edbb4eda8/83043960406.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f655491de---romajeteve.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083406e346b1---28438936968.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=brought+it+out
    • 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_off0000f82c.bin
7217f4a59f1d350ea04e28b5c08e3139114d365076c690089390b85e9ed62504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 23576 bytes
font_01_sfnt_off00013236.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 16792 bytes
font_02_sfnt_off00014a4c.bin
d7d0f8add60f1b3acaf2caf79f4e93474c8b27cdbd881145759ecf709e605929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4C 9928 bytes

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