Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb4a4697baeb2bb…

MALICIOUS

PDF

117.7 KB Created: 2021-06-22 12:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b0a61fc386b4207e21f1cf8fd9b7600 SHA-1: dd41d345febba6c74acae761ba99b20f0974321d SHA-256: 7bb4a4697baeb2bb4320ba9be53e5d981c41550a9426c603b54debf48d532c45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing infrastructure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9115

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=caleb+critical+role+character+sheet PDF link annotation
    • http://aite-materials.com/upfiles/file/purofibudakur.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/65883060726.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/jupabubugoluwuxeja.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d361d355---fowuvekojelopubi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b0ab5442c---70728902676.pdfIn PDF document text
    • http://hydrem.ru/images/file/retesigiruf.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c857680403---kezajebolodotuvug.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mafigunepubadu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tejomebofodepawuv.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/58807947954.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/gezirivirab.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/90e4f35107ef28627e2356d42dbbb00c/sowafinalewedodolotafazi.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/79382301643.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ef401c097ce0a31b7ad9efa51f56e95b/divodidosakifafesigef.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c9578f8a---49552379689.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef518b06a07f35e90e3560a962a95339/kezaziz.pdfIn PDF document text

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