Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ccf846a881f5ab…

MALICIOUS

PDF

47.6 KB Created: 2021-09-07 22:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7da77a7053dd5346d684047fd818ca31 SHA-1: 20048efc475ee1636ad72aef4faab9a16536572c SHA-256: b4ccf846a881f5ab4055a4b1565d72dabe4ced7842c070152318e55eb1d02ad5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6210

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://synerhu.ru/uplcv?utm_term=diagnosis+of+multiple+sclerosis+progress+and+challenges+pdf PDF link annotation
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/44646182172.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/94636622377.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/465dee755bf491f7df0056e292ef9630/73574242200.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/wazojesafovipibeso.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/gaxejudepivagapirojaj.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/fitagopupege.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/wikaxekeluwujipavuzukaf.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bcab2a821---ziwugofu.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/69451179575.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kubeboxikowesuxebigoti.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dubidodir.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/34889950019.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf580e449---1952612851.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/72380525080.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/92985927174.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b4644d041dde146e0acd23c15727a57f/49487195724.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/wowevitawatejir.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ba639ad690b---rizegu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132abcbb35eb---kinubakisetu.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210805_053643.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fifalege.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7ae2451f1baaf098d6c1846be4201e9d/nenijexugepifaju.pdfIn PDF document text
    • http://haki.vn/uploads/files/jesarokimuzomori.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210609065858.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kqkntrtntfdnopevebt98h9gjr/7732976645.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/nazana.pdfIn PDF document text

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