Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cc2df9354db4d0…

MALICIOUS

PDF

63.6 KB Created: 2021-09-20 22:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8f2ce266c3120f4e2d8c09e6bef67494 SHA-1: aaf0664d955da34e8785d79537c965acfa5ac80d SHA-256: f7cc2df9354db4d0586eea2fe30fdf5d82d0a1f55b04694e53098e39a56f2e2f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs. Heuristics indicate it functions as a link farm, with many links pointing to compromised WordPress sites and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5407

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://queure.ru/uplcv?utm_term=how+to+check+the+touch+screen+of+android PDF link annotation
    • http://aviapartner.biz/js/ckfinder/userfiles/files/23978226799.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202192053046.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210903_718A769C2B895B2B.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/61441642955.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/44636467140.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/nutobosivupoliwabujimeti.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/jutufafomuroribiba.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/morowu.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/sasavejoxumopize.pdfIn PDF document text
    • http://getdol.com/page_data/file/gadawatofogibuwasipebujos.pdfIn PDF document text
    • http://djpress.pl/Image/files/kivavawefuxebimosupudip.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb7ee215c5---penerivitanasililik.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/93079947525.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/60475373783.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/97306891651.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e038051c1384a8fbc7f9723f3d8d862b/gumixoz.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ljr15pl7igf8nuqve7tbr5tnlb/98676651290.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/7511646502.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/lojonul.pdfIn PDF document text
    • https://trainova.com/userfiles/file/vuwita.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/62741220616.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/filub.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/robudoseka.pdfIn PDF document text
    • http://proxima-online.it/public/file/22669447355.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/tixifoketuwagesopox.pdfIn PDF document text

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