Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aaabd696f61edbd…

MALICIOUS

PDF

44.5 KB Created: 2021-09-03 04:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d853f27803989920f670cf542b0bf07c SHA-1: 6420108ac58270ecbe18a96336d311e24af147e0 SHA-256: 9aaabd696f61edbdab9f8470547afa289cdd2d82a90593df8086d4375e868fdd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pl3trqtgocve4f7022vvle6oua/mizirogit.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dd23c7a12d01da003bac18c4cd29019d/44533871804.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/66728121245.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/valepakerepiboxarupe.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/82603281437.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d79crujfk42vhhbc1jrfr7op54/18055759741.pdfIn PDF document text
    • http://coachhouse.info/assets/file/52615306277.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/darirunokin.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xijumesojenojij.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/sirekeve.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/89218252830.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/01ihq6jghp4n8p300ifmamin72/xerodude.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a781728eda418c153c60e80691ecebda/75995296677.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b06587af1651035a35d0325ed13e1b20/kozewegobafabelonaxiwu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/13248nioarq3usbs256qcpms33/14771834941.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/govebimiduvujeveluf.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/purolonutatutuximifopu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b04afaef4da---mokejesokopulotizebese.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/wudizujigis.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/dekigi.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/2463288281.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/5588562784.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086786f02cf5---kifodi.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/62959786001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=convert+pdf+to+english+freePDF link annotation

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