Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b107bf3dc0d7a9b…

MALICIOUS

PDF

53.0 KB Created: 2021-08-14 17:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66111939c85e435708ab744187af3dde SHA-1: ddcdf4827fea9550000f792333a1fe350592e77d SHA-256: 5b107bf3dc0d7a9b3265a6e6a45fd03de41ed71c99935064bc65510c3fb2be04
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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://philabc.ru/uplcv?utm_term=1000+palabras+mas+usadas+en+ingles+traducidas+pdf PDF link annotation
    • https://jxloanchien.com/style/postimage/file/bigigubiweburuxezexepif.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d15c3598c---83096925904.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/nowitig.pdfIn PDF document text
    • https://orangerun.re/photo/files/webasej.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/xomonumit.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/zamawamozilivedejimiw.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/xojixepadoj.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc033d4bd---86200288177.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20539ca5b1---53553645233.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/80281141372.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2c3f5d90217aa4ebc16dfe0bda82add/woralamu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06419d65d---pomajip.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/89937000677.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9l05i7nfpe31sv0d4ccnblece3/40933233852.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b5123ad78---53674189464.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/86666641302.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/zimunufokesupe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/b9vbgeibp08d8nq1hal0mfn29e/90583085894.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dd1bfb8de9ce16522a9d503439d92b7d/gipinopu.pdfIn PDF document text
    • http://servmed.net/userfiles/file/kubor.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f1b2731b5a4f1f017587d969e5c01528/51458240014.pdfIn PDF document text

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