Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50be67d9b986f65…

MALICIOUS

PDF

59.8 KB Created: 2021-09-06 10:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55a8c84bdfcf254665546a464a547439 SHA-1: b689cdaab7a3fe472655a8ed0b1eea04675ea15f SHA-256: c50be67d9b986f652fc1e4774af6683f60339cbf2d8e349efc853065c47ccea3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to distribute malicious PDFs. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/40c7b49d9e718fa22fefc677793b79e8/bokosolizabufinirifagegu.pdf In PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/rabepupojosavawaga.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4dca5c121a8d0060bca8f20a90b62454/89172065632.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/35643134352.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/sisinavalakez.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/razumevetulegagunufutod.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210618092409.pdfIn PDF document text
    • https://ancoraeducacion.com/images/bilejugevuzugusulipojori.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/5026877719.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612740b279b1a---2499330073.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/kuxisuzinokovib.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/36365646916.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5m1o1bacpe5a426jkj95f82r37/18464087803.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cjsnh3k9jpf1tfintpq3jk9nm4/dadewavogap.pdfIn PDF document text
    • https://blokhol.com/upload/files/16974984900.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084b46222aa9---liribawu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/sozanekoma.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/laxoputopovefitinudib.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d694d44d---womeze.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2f9e54a16bc425d55b2bcbc4263c1bd7/nobobizimubod.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb540cc0a0---64793386131.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/46424785438.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/32057158784.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60ED5B773B175.pdfIn PDF document text
    • http://vhshf.de/File/tugujewiferasexu.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/razila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tipos+de+adicciones+en+los+adolescentes+pdfPDF link annotation

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