Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8f386a22c124c3…

MALICIOUS

PDF

70.7 KB Created: 2021-08-13 23:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c8f17af8116d0467013bed98687f8b0 SHA-1: 84c8de3c3c32b109df800968680796bdae1b3f68 SHA-256: 4b8f386a22c124c37a0b8eaa3f1dba968c27ef2ac081b0f2529def6bdf5a4692
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting domains, likely intended to host and distribute further malware. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to a PDF file hosted on a suspicious domain, suggesting a multi-stage download or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=el+principito+2015+pelicula+completa+en+espa%C3%B1ol+latino+online+gratis PDF link annotation
    • http://chobacgiang.net/webroot/img/files/badorikoninimesuvikifidu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161032bc8b0915---tatekasuwoluke.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cf273798bcb38bdbac0adc5bfbc0ae5b/63451203493.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0b3dd2b42---puvimefeduvawelerew.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/54905460996.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xadofe.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/12021052681.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/cbecc4a825ded228ecbfa9deaf4885cd/8107987299.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/wibivuvitegifusa.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/69478737429.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3ffd7249ddaeeae2cccad0a6996f0c38/16303635189.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897ae3ee38d---dareje.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae311a742---53619463072.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/xabegaro.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/decafbbd4b2818179b38b884e422dccf/91960312573.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/rnn0qkrenalr29n9hk9ct2kld6/fuloxopawajimekarerukejej.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/20862676701.pdfIn PDF document text
    • https://kham.vn/userfiles/file/64862951693.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D1A14E9B33E.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/fb00135299466fc3094ef3f6a0f1ee1f/85049577418.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/23299438382.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/74529383189.pdfIn PDF document text

Related samples 8

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