Malicious PDF — malware analysis report

Static analysis result for SHA-256 8716ba370355056e…

MALICIOUS

PDF

54.4 KB Created: 2021-09-09 12:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75f0021f12c929e4f58a34ddc6f41567 SHA-1: 391345dc105b43717a9e11f1f6b0ada61d4171c4 SHA-256: 8716ba370355056e402cd3fda81c112b462d4f97eedc146bd7cd61aec819eedf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV, specifically a phishing trojan. Static analysis reveals it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure malicious links, and the presence of 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests exploitation of content management systems for hosting. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3565

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://zagi.hr/files/77259726076.pdf In PDF document text
    • http://emeraldcovepartners.com/_data/images/file/filumuviguxusamelu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387e1255d93---97141223760.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/faf76eb6583a2cbe7ab5983bb5185a63/48497480979.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/tanoleruzifewewilizew.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371eafc1a15---fuzaxiz.pdfIn PDF document text
    • http://it-hair.com/userfiles/levifapapurotuwexoto.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6141a4efa---tufukorepipofuvuk.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/70674704885.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/12243567531.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/wazuviliwujibim.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/nusisaxutila.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/82256905617.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109090504154861.pdfIn PDF document text
    • http://15881588.com/ckupload/files/79701738366.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pikidenene.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2960945054.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/75255379210.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/juvinikowu.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/rumani.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/tajunejerojojirozupenosi.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/64737583431.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/nomeporimubigatu.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210903101653.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/79890187554.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nomemigo.pdfIn PDF document text
    • https://nistd.in/userfiles/file/motavajorefiviwitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bloquear+n%C3%BAmeros+desconocidos+androidPDF link annotation

Open this report in the interactive analyzer, or submit your own file for analysis.