Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ad8d9beba0c222…

MALICIOUS

PDF

64.3 KB Created: 2021-06-10 07:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f46c43dad7c4fa0d9a7ebf5a1172af25 SHA-1: a7bfe9e4b6794a5bb55f359bbf477f4148406dfe SHA-256: 73ad8d9beba0c22282c227dbac9b86dd33b506ba29da3ed6c09bc12cdd16f303
162 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting it's used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URI and link farm heuristics confirm the attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

Heuristics 6

  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://ketchas.ru/uplcv?utm_term=modal+verbs+exercises+a2 PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/811de80f40dcaae44f9e1ee5fd3d9e89/55188222327.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500b21c125---tujipibomidimojapip.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7103c75fe813b5d50b788d2efb137224/lopobetunavuporalel.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f77e0d261b3f90dd43e0f9c8b01361c/gefibofugipofit.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607673c060ea2---vizuvinona.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a6421b1d6---19751879239.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75d3da6e3---rarafikosesimiso.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a0e43e50d---35990502844.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/36813593654.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0646a6f35708b78b896ea9878ddff6ea/jezolopenoma.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/wuzotufarin.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083d1d14efe1---nedufevukad.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/3211ec623b37385e46aca740e3ff822d/32317667770.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/71649710749.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813cbde8af4---vevajavuve.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f833a8b3b---54992206543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 5340 bytes
SHA-256: fa14bea2a7c2e136c84e0970155a7eec49faa0c5ebe3d2164ba0879784e80fed

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