Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67f4607d8b53373…

MALICIOUS

PDF

107.4 KB Created: 2021-07-04 21:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef617ed8b608d567f9c0d3f01079f33e SHA-1: 5bf1e74e9f90d2be480e14426c9932fc6b13601d SHA-256: c67f4607d8b53373b99133625520730f0b12b7e08ef58ee519155d5db26a3700
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript and link farm are used to redirect the user to potentially malicious content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5383

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=the+angle+of+reflection+is+equal+to+the+angle+of+incident PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b49420e33f5---53764678840.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/eq7dk8ogtijuuric995tbg8dc3/81419351272.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/61826397204.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0175423ed---rifonen.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/44053569166.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/45408186195.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/7940926360.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1fb1176da---41097315108.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/62981581213.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6d56f4b3.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fegudusexagedaxitokumirag.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fea42a4963b095745743114b7bd86d4b/nawipilubapidujeda.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/9170302656.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607539ed6b019---xatadorotenedif.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f9ae5c98---63052482999.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/21615567731.pdfIn PDF document text
    • http://01host.ru/userfiles/files/vitizoxugupesawono.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fejalugulujaneg.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081f32cd25e2---34690204819.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/namesavule.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f6e16ffc6---poxexugolowaz.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/gosakubufaseres.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90533ab57---46968232115.pdfIn PDF document text

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