Malicious PDF — malware analysis report

Static analysis result for SHA-256 c132f922da4e597b…

MALICIOUS

PDF

54.0 KB Created: 2021-09-04 20:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b856b66f3c93c098f3c91afc3f253e4 SHA-1: 31bdc38e068714f8b073f60e997f678a1275f03c SHA-256: c132f922da4e597bcca5e8a57d9f64475462ba8190785e7dde5863be2e64d063
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5768

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://live-lessons.net/lcj/web/uploads/assets/file/53171813144.pdf In PDF document text
    • http://quinta.cl/upload/files/releripu.pdfIn PDF document text
    • https://clinicscrm.com/img/files/66119504590.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/54549597799.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/14838793383.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-25/20210825011732134397.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/ximanivabilalizojajobulo.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210704_A976A09C4D28321F.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/novexe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f583926bb02---wagofusibalod.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/3999108081.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/70221047370.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/55405667480.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5fd13603345b76ae453ec1afc8a38db9/nunodowinaxusopagovoxo.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824f5996ef7---kekoronifaba.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6a157e8c3cb7a528909ed7698a743529/19331932089.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210709_122613.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/79832368986.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ct30fca8s2464quiqnepk86jd1/91037796937.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///29065515993.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/33138488676.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/tizilikokanexemonad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611544637fcc3---ranitupowip.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1287f019b---37385762904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=methods+of+teaching+poetry+in+english+pdfPDF link annotation

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