Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd50d3c0cbe78b3…

MALICIOUS

PDF

59.5 KB Created: 2021-09-20 09:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc4c4e514a7df0772d693cb5ad9c3e04 SHA-1: a0e446ecb94a35a5c205fde9a574737be85df658 SHA-256: 1cd50d3c0cbe78b3926a7753bdd2a64f4a6bebaf29ace76ea21d271fc99f5fc0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF containing a link farm, with multiple URLs pointing to PDF files hosted on compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a malicious attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3246

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e84e4d8c0---bozividin.pdf In PDF document text
    • http://jyotiacademicpress.org/uploads/file/kedumizodud.pdfIn PDF document text
    • https://luminex.pl/upload/file/2333179477.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328f2623814---wisipasoduzonadunanado.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16137d20d78532---wobajibukiz.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a18e7ee2e1---11648308422.pdfIn PDF document text
    • https://matratva.in/userfiles/file/55841271700.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/sowinu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421252e8ca6---53535400105.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/64366368993.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147cf7abd34b---zefafi.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/salivitaberutotepisalojid.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55e19d6c8f3004a15df179abedc775be/lokifewanunamepe.pdfIn PDF document text
    • http://juncheng.tw/upload/files/pazaxenotudisuw.pdfIn PDF document text
    • http://i-dron.cz/data/file/zidivazuxalu.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/28978842675.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/jezorogalakunoz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/39eovd6thqgglhrfekf4c7dth6/vimogaxip.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/9512366336.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f8492ce9fbf8f549e850fad552c8cf11/lomolawogovopekitevamo.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/temiwemuk.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/wujetekuwigufuzozarepaw.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/suxavezus.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvm21u6289igtkbcqsh2flu8jh/kasutudi.pdfIn PDF document text
    • http://mobiliteit.nu/files/2336855083.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/zorigofi.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/87103534044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wifi+jammer+app+for+androidPDF link annotation

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