Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3b025741c6e3bb…

MALICIOUS

PDF

88.8 KB Created: 2021-06-25 20:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9507f11874eba3eafa9c3b060c32b05 SHA-1: 0e82dde9532faa8a934c010f835329e910650211 SHA-256: ef3b025741c6e3bb1c5c372c98ffa3fbdc88413c85279aa7012650e8f627c42b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5018

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://queure.ru/uplcv?utm_term=friday+night+dinner+quotes+jim PDF link annotation
    • http://agcslohian.com/userfiles/file/rirepudiwovobeli.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/21268940785.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/1p84b4s1j6shgdrmsntuo9ssje/kaboxetabupujeb.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d945d4535e---zitububotubijemizufago.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e81fef01f---tenijedezuvume.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/fefulumivoxelunefisi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096511f9f64b---rinelifa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad454c60e4a---59750149820.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4924e35be---joxugerizuvogisimimal.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/escjakmqnt4t4j2vulgg58f1aa/41005319490.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/bikumijosovo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb00d82e10d---zuzaruvo.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/e3c2b348595014bbfa90e6d6f78581f4/49136846896.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607087c6398c8---zaxuf.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/75200786107.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mazuxivefemotesijawazux.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2a3d6704f6962b3269718faa25b316db/fofaguwirulemepowi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/81213ae36314408f7be52173f8c1f9b4/nexubefavovubozipoke.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216241755195974.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/d3b7e275a7e556b5165dcba514768753/gonefevavegok.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b64ae9f3d07---25927689144.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b036a51263b3283595e0373a96b1abec/bimutebexuvapopid.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d391b9b7b3b---95170174831.pdfIn PDF document text

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