Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc3e6ebe81bcdbf…

MALICIOUS

PDF

129.0 KB Created: 2021-08-09 06:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f18294595b90341fb39d739a9b588e5 SHA-1: 94296f0f69dd5c9c83dfb85110c49d55040c594b SHA-256: 4dc3e6ebe81bcdbf83b75d7d19050d973424bdcadb77300378bf65f4d55c6c54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc376413fce---52456538760.pdf In PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/pebuzamawe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pofoki.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/87904065675.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6c4031d959dfc74f98f1b7d84c453d6a/sapubakulibuwubogobubife.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c5mrblkfomuflag4fi00kb4338/vifixogejive.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/87600665487.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/27958705209.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-29/20210629110624120297.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/kedidabumotelava.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/784014289.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e68f116d3---70980044169.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3t9ftln2225msr6k72s3gup704/88348086145.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/33823707018.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/80833090296.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m6r8n8drpeekvf3bddhqssleq/pasirolijex.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/lopejozukamigavaki.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/jigetagu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/nuxogiriwo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210602/210602072402290604t46nj6zjoiir.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/38353260688.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jajigimilir.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/jiginejaposazilonivaz.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/97889471963.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bacda51041410242a9db2c1512ef7b9/57837222018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=halo+reach+game+unblockedPDF link annotation

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