Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb389f7c806892c…

MALICIOUS

PDF

46.9 KB Created: 2021-09-24 04:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5d3bbbf536ee0613fb46d9c8098ec90d SHA-1: a135eb36486a4fc3d2862e16096c42e07ef50902 SHA-256: ebb389f7c806892ca645551e1875d3bb96578601ebb8e4057f6b58ec2fbb6967
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a significant number of external URIs. Several heuristics indicate that these URIs form a link farm, with some pointing to compromised WordPress sites and others hosted on disposable domains. The embedded JavaScript, while not fully analyzed due to obfuscation, likely contributes to the malicious functionality by facilitating redirection or further payload delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7471

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vozilasavozacem.rs/files/megiguwobawuguzu.pdf In PDF document text
    • http://fanghsin.com/uploads/files/202109221816565394.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/72228895658.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d4ef543be76fca6a0a5324c627d66b28/22440124336.pdfIn PDF document text
    • http://veitali.com/upload/files/mididerukogiba.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/rowakekorur.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/beteperogakofub.pdfIn PDF document text
    • https://norservis.info/files/files/satabekodureraludevoneb.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/44101668458.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210924090308.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/gifojexazewobezojinix.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324bd8678ec---bimikutajuloz.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/marijaxukumesugus.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/josipe.pdfIn PDF document text
    • https://trexanh.net/upload/files/25578219952.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/putepunasizeberutaxinoge.pdfIn PDF document text
    • http://ccsl.asia/files/24281614180.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/xasuwadojajeku.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/vudabope.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3e7bb6dda33a8d943d84f9f11966d23c/wufijejisanuwezuvu.pdfIn PDF document text
    • https://titishop.co/upload/files/mamunawir.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/fovimulafufip.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/82061721300.pdfIn PDF document text
    • https://carlojans.com/cms/file/22963230220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hulk+rope+hero+vice+townPDF link annotation

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