Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852656cb47582a1…

MALICIOUS

PDF

56.7 KB Created: 2021-09-12 21:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7966ec2da8e8f30226c6cd7d314d693f SHA-1: 52da153fc2e5064a3c03ca7dd8259d178627e5e9 SHA-256: c852656cb47582a18be5041700302dff347c8b575c5bbb66bc83c2e7b6124ce5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5388

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://ceiling.holcom.vn/webroot/img/files/bakoxumevomatosariwofog.pdf In PDF document text
    • https://gulamanis.com/contents/files/fubakatafaritunoduwi.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/37410796268.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/gufadetubesudesumep.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/85773380405.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/kegiwebujipiliwigirefobex.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/86027750833.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf2963b1ea---bozegepusixegotep.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/83599636212.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/mudizatijifer.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/89300898124.pdfIn PDF document text
    • http://fitviewer.com/files/file/77498641569.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613213891a81c---27229183349.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/foxerik.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/egf60k3cjgetshjato1k1qhiv6/lezotisekoxifitovepep.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/66776313572.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210910054155.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wixuvulowewujigoviguvomax.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210907_0BD7FE42B747391E.pdfIn PDF document text
    • https://paperland.bg/uploads/file/27581439798.pdfIn PDF document text
    • http://teifsepahan.com/files/file/82626023289.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/bimozijixafaxagok.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/91799048707.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677ee5c7e2---68501898876.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/27418233016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+free+online+movie+one+night+stand+2016PDF link annotation

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