Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d03c556146c2ac0…

MALICIOUS

PDF

56.7 KB Created: 2021-09-24 03:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55f7e7a90bfe2db4185ae49a52a5fa0b SHA-1: 507d24759c008a5488bd8707d6ee38df9a6ae7e8 SHA-256: 4d03c556146c2ac0bb802ad8c2a480a58f5c3391b9db1d93f4ee7e6dfbf8149e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and structured as a link farm. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to distribute phishing content or malware. The link farm structure is indicative of SEO poisoning or a method to obscure the ultimate destination of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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 http://liccuza.ro/stiri_files/file/gavomifelogivemopolosak.pdf
    • http://omonetach.pl/foto/ilustracje/file/65167130538.pdf
    • http://leguido.net/files/lirerinusadedesazuvaso.pdf
    • http://geyikkimya.com/userfiles/upload/file/30183450306.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/felejagiwimenovutemixo.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/nagar.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e15705a3---bokojelezobebusuditunoko.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/savosibeka.pdf
    • https://fortworthdental.net/cmsCart/upload/file/vokulibaxidenobazikabepu.pdf
    • http://palazzodiaz.com/userfiles/files/mupetabapepuvopevofalir.pdf
    • http://syekp.gr/sites/default/files/file/53293061383.pdf
    • http://inbjnews.com/data/cheditor/0603/files/95446200449.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/79482132613.pdf
    • http://almar-bus.pl/userfiles/file/80987933650.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/u8pk8ln4c0sitc2at1vjmp5i8m/21209689736.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c7111c05e---laluguzazituva.pdf
    • http://qunjl.com/userfiles/files/48218869791.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/38c2528078088c3808b0e7d674edf614/zizisagodetoxute.pdf
    • https://dcmheavyequipment.com/admin/images/file/39073186249.pdf
    • https://bwawarszawa.pl/upload/file/nirosotesewe.pdf
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/dibib.pdf
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/6593062503.pdf
    • https://pasarangroup1.com/contents/files/55530804909.pdf
    • https://tennis94.fr/img/pics/files/67421593398.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/818954a7d85dd340c1e5b1184a755eaa/moxivuduwalukota.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fifty+shades+of+grey+watch+online+english+subtitles

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