Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0e7d3e7c2f82b4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 02:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f19c2836d5116c1becefa31ef4e034d5 SHA-1: 2775ba69c184b55e5202fda2c39dad337b682dbb SHA-256: 2e0e7d3e7c2f82b4c330ab16b33689933146a329a68e9ba14822d55e91fcd1d2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nomylo.ru/uplcv?utm_term=manejo+de+cultivo+de+rosas+pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/zamotu.pdf
    • https://daaeportrett.no/upload/file/wuximoratajefirar.pdf
    • http://maribon.net/app/webroot/files/userfiles/files/kivabudewabelexebumu.pdf
    • http://4seasonstours.in/userfiles/file/75406690403.pdf
    • http://abnicum.com/files/file/melod.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072b5545b91c---14207690589.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4525d0403---bagevi.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f6cf21bbccc4f2fc2dbdc901ea312f3a/87089478186.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/crgmbrvjgtgfofk939167ldrhk/jusepuserijuwifonu.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ekkola3pd1e0fgod5opbg8rdf3/girimuj.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a87f6385bd7---tugefosi.pdf
    • https://csodamalom.hu/files/files/45925317873.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/wobaremabowisevoxitobaf.pdf
    • https://sonerofset.com/userfiles/file/17858334188.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b714e497bc67aed8fe3b93bd501652a/77280221007.pdf
    • https://werbemittelag.chupload/file/kowijoja.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/1974p09mcf07s1c094mrejoc8o/werutidupa.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/83277243935.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_off0000ce5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 16792 bytes
font_01_sfnt_off0000e66c.bin
976d2476cde16812ecd4b4f768e3ee7fbe6597542450b60d7cd2d588cc12963b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 18480 bytes
font_02_sfnt_off00011525.bin
474e0c7d857b49675b3eb91d4985675ef80cae9cf65b8a8c666f25c44e6bfaa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 10900 bytes

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