Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff8bee1d333dd5e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-12 11:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5fed7a1f0a0b1789fe1583a940e74462 SHA-1: 333a983bf7e86000798cb3097ed92bad2294da6b SHA-256: 4ff8bee1d333dd5ee61716eb12225c5e974454b40f693f8918c170101fd77db1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8029

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://cartolmania.it/file/pujedutenolubofakox.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7378df16---86350734417.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vixepozop.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3b443937180c68770667fb37829374f9/panunewakuvam.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/12000776664.pdfIn PDF document text
    • http://skolky.info/foto/images/file/21244938592.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/71831758132.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/salivitaberutotepisalojid.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/45567631823.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b34b5091aedfbf58e5fb2d31826168f1/81422800954.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/107482311761362ee41d4d5.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/lerowa.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/garemuganawoli.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/niduvokomokonikuwozevuzu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae472a78ba---11950055095.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/43250710825.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/sojezazopata.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/80178724134.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/47328659834.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/pefemulejapebozagu.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/78349694161.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901071507_4b2uni.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/2826307397.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/lurubiwud.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/26387075767.pdfIn PDF document text
    • http://usateatop.com/_upload/files/35950101535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=aplikasi+tulis+tangan+androidPDF link annotation

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