Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7a32a6f5c1dae4…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 10:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9b8a33eddc5b278f3b798fa770483c9 SHA-1: 1256c6949aa5452cd0d4873f8bd3e37a0eb6dd31 SHA-256: eb7a32a6f5c1dae4e617dcd628602fd041f9c6251fa34a712bc09d4c926abb26
164 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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/32712000429.pdf In PDF document text
    • http://mtjjt.com/2013/upload/article/files/2108201006061792995uzxs.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/xexewasotijatoribedizi.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/jepimazebejodixudorovadab.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ddf647d59f98ec75197a73cce6e7b261/susezavodako.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/48057247246.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/xovopuzaposutozeberap.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160710bf45daf1---14735171820.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108151656111511.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/03a21abf8811a9acaf2bf8f30a86d767/zojukovawawinawuponefobav.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/66319627389.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8a34c9938db230dbb0160f3fa6d3fb38/gofalexovokurefakafi.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/xeliraragadoxifovek.pdfIn PDF document text
    • https://actor-conseil.com/files/file/79408786686.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/26/junawuna.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952a5e5888b---lanudavige.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607add5404b1f---kiviligukal.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/jufawudiwase.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/lonubarezab.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/n9fpaaq5iqskb7mgedqp0ihdi1/nuwafogul.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/bogadufubodujawaje.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b3638a730---31739984221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rrb+ntpc+question+papers+pdf+2016PDF link annotation
    • 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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 11460 bytes
SHA-256: 06576f6b80e4a60b1dc64b9ea0719daf7feceb3df4ad38bee6e251e37886aa33
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 17672 bytes
SHA-256: 906a9fee528d5d5e06f3f343925062f094e7177e920980bd17ef87490bd46505
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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