Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05a99f1fc43f268…

MALICIOUS

PDF

61.3 KB Created: 2021-06-27 10:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 65250c3145920579da2b70b80e2eee50 SHA-1: 38d414f0d91e0508787bca95a8f6e73f23045736 SHA-256: f05a99f1fc43f26803c25bf02bb9b467ffc3776b3e880e1fb29ad58185d6465e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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 https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/cnbtb9qrlb9vvgkra6giik49rf/nimazaxanugolen.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t1r7ctpjue26iigei9tlcfaadt/72932984408.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/71234439815.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/k4ssos32iqsf1tbkrdgeqg8qg6/97008452151.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607258ffd0f5c---65388483203.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/mononajeniduraboromepizaf.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f832aed923---nakizerawa.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073075ce6eff---mivagawagi.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ddf9ddccf9aa640544f9f8b602d3946b/vulibatek.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8baf9c24db---liligugilularudedimul.pdfIn PDF document text
    • http://sowitech.vn/upload/files/67510290059.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608f25722b790---wononolifazosemavapem.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oi2gufe0a1loeovihjdcdpv2ho/wojajamofuwekujoxux.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/74991018660.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e40a2ebe8---96045665094.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c7301e843---41641713908.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d1273fee4---99700427522.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9d447ebf67fd60ca919a3b5df3539398/51961071656.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sugixiju.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/sazuxumufimovogol.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/llnk1lcontbq7a34nmndh7ut1v/33815035717.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6fve3asnl710qdkbkkhb57gvn5/66741623332.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/fced7fc5e30a1a2e728a0d5ed853fd31/xoxupinewotiponesiridu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bc519b77f---50280228020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=comparative+and+superlative+of+fewPDF link annotation

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