Malicious PDF — malware analysis report

Static analysis result for SHA-256 0439d6a8093e4c0e…

MALICIOUS

PDF

144.4 KB Created: 2021-07-07 17:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89a1744e49eb0528f72025691c0d1891 SHA-1: 2b9e54425b85ac79ec67f1a5521990cb071abe6a SHA-256: 0439d6a8093e4c0e403889e5892e0256c6807995753ad397c2f80325a8b120de
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content or facilitate further compromise, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 6

  • 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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ec213b82f---88131903398.pdf In PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/69136477805.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/33600695784.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3feb24443a---55684433249.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc7385b56---jomep.pdfIn PDF document text
    • http://ubest.ru/images/file/37905199278.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60C3C9B67DD72.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/58254694255.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/zezigekanozuviniraf.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/fijezefugorodegororuk.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/robalin.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b7c4ccdbe758921f355cb3389d984cc3/laluno.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/83503014011.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/rixonuxajatavinugofo.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/xivikijodel.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/1d6f8fcdp4sdbrlho13tt2hjuf/55650887233.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/magitotupukem.pdfIn PDF document text
    • https://birotex.rs/images/files/26546709770.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/55caecf3d95bed71cc4fa1538e1831a2/31247330457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcc81e55e0---41348374948.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe9037fd6---gonopezirogitena.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107051727069846.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16089344f77e1e---67865196337.pdfIn PDF document text
    • https://purefeeling8.com/data/file/56600130158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=heart+all+i+want+to+do+is+make+love+to+you+livePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 10856 bytes
SHA-256: 4d135391465f07e10ae2fb5c6d039004d3847cdd529e03a91e5070e541cefb3b
font_01_sfnt_off00010fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 16440 bytes
SHA-256: 5c646b286da21ef3751fc5f7d66c987b62987e4e159234545bfd1c00606536c3
font_02_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 89492 bytes
SHA-256: 7f07d1d51c83ceacdc7cfa3346caac00dfabece0001dfd74bb7cfc53e96743fd
font_03_sfnt_off00021928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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