Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e16549e113cb14…

MALICIOUS

PDF

62.2 KB Created: 2021-08-19 22:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5b48b47dab5b97f875f5a7a2e361d28 SHA-1: a276f7c0ea12df12eac9f83118235b0bbfa0ff8a SHA-256: b4e16549e113cb14f5ae96cb8b64ffdf00734e248c4a4ccdb71e415f062cf486
94 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute payloads via these links. No scripts were extracted, but the overall pattern is consistent with a malicious document dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9285

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.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7579916ccc---972347142.pdf In PDF document text
    • http://sentralperdana.com/file/42134249645.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3cd49861302eb411de042e19367638d9/18671899481.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/tavilabokaxamuni.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/4629776498.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19299033c---toxejekedurag.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca9d1ecc0---83604234489.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf86fbbb02---vasegokuxupagov.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/65cd41cedd799bb54bc32c7f18493766/3925164758.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c136c2b7d4---57820978394.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/bajapaxez.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/7c8d13c84c287dbb4dc724d75cf6dbfc/78218218315.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/69883976557.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/32597836125.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ec5aa0a7eb1990c974af4ae0837a96b/taruxojimazalifi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6a16bc31---dezovokosefo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/15215608820.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c8bb0c31233c2d04941223ca5706b212/dexobevimugopaxogojobuv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161132c2203122---borixixuvepejoje.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/94852787307.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86077cd462---71599646534.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850f32674f---pufofe.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a2f916499348c474a18f3c5faa718bd5/15954097797.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/796204629bddf9b7c79c051ba4a1650b/27322634176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=power+pressure+cooker+xl+quick+start+guidePDF link annotation

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