Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9ab81a3c14bbca…

MALICIOUS

PDF

69.3 KB Created: 2021-05-28 11:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9b03825d9edf76246b4cfc2a620361cc SHA-1: 963f0af8760dc1448a9f7d865c98e48b9db8dae9 SHA-256: cd9ab81a3c14bbcaae696d0c94e52b8346b030bc163ff7dbef0021d042740740
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' and 'super-forms' plugins for file uploads. These links likely serve as a distribution point for further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

Heuristics 4

  • 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
  • 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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd1cb72fb---39895921678.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160887264b6298---47448751096.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8ndefs1qmmgstq6g1jcrmju130/69718133222.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160866d444eb5d---78171483976.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/76b69ed81961c66856b8f35fca80fabc/20024900607.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b2e63e3ac31ee84ce952f1186872b41/vodawurofe.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/luluwiraremozanifiroxupal.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/12670555870.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e74b52d0129bf6b2444063ed852e354e/jadaxozux.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b2002f53---kuvigubabutokozat.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4b0dacdad70478495df12c0487f6a7cd/25700714502.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160795e7d5b971---57523287984.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfa4aafc3---tosepomizamewusukasav.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/papifelukinufiku.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/47775874141.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ca5f8033a9aa52bf908694b03d4e9ed6/36883557846.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/a3abca6c92d20b1ac1b02032d0537dde/buvunu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825393ea277---bubuzebanoxutogukefuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=libro+todos+los+dias+son+nuestros+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 5116 bytes
SHA-256: 8cd031ead8a1d940a53fb121676e63deb787ec3b8730db915cbb9dc7ee291dd3
font_01_sfnt_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 11436 bytes
SHA-256: 7a0bd3a135aba0a5fc89bfa56613c944f5f8d9294423841a686879691cb49a09

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