Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef27957d7857f071…

MALICIOUS

PDF

70.7 KB Created: 2021-06-21 17:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2b113600fc31ecd346aeb10dad029b56 SHA-1: 6a9ecd39809ed66e255cd0b20fe168e4e86eb017 SHA-256: ef27957d7857f071010165317df21d05846e23969c3f92055827d54324feaffb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to serve as a phishing lure or download a second-stage payload. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=photoshop+4k+background PDF link annotation
    • http://biosafety.biz/ckfinder/userfiles/files/retosejuzipulo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff25b6bed---fojegivuxexawe.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xononaxigosulujob.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bc6e9110c4b9fc2a1cb9fe089bce8da9/jogakakijabapis.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/21991856004.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/971c263bffa71951c55cfbdb125829c8/punupovike.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9uu6cdtiopvidpu2jq7k6s42o6/81966716923.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae1f72aed---movopemaju.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072deee9a834---55083678348.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4261d731ba27a6da3b07de4944f44164/45594346142.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827f41d8560---lupabuvemegevurogulerugog.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/muxodevepuxagemizometa.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f78aeabaf3c3c9fc6311b7ce3ab5baf8/9290603822.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/37f87e2810da4385709ab1649e8e5b10/vemujuxere.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/14a83d78012e1b6167bd0e003b6a002b/vuwowebuvogefopivegarilip.pdfIn PDF document text
    • http://aps-mes.com/files/file/ketoliluwa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 5596 bytes
SHA-256: ee1251e254ac9cc2501739df4bf9d136af84c475d93077293e7fd997af857951

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