Malicious PDF — malware analysis report

Static analysis result for SHA-256 187af30731b3a889…

MALICIOUS

PDF

77.6 KB Created: 2021-08-05 20:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d439931c12b1f83c41891e80a9b120f3 SHA-1: 0884610731eff6c49a2563905f688a6663a1ccab SHA-256: 187af30731b3a889c87c71695dc3739e9239d2d9401d0370a33b217e3b12be9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9238

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=aprender+a+tocar+teclado+pdf PDF link annotation
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/t6qhkk8dffofakfaarvq2husl0/sunuxi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099406ea957f---nejojitosoj.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e8c3e28644528e7bfe06623a4ae00e57/fuwezutatekuj.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1b707093f---92490307289.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/86904621871.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607053fd1446c---gopokunalolu.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/79408594194.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/73922585364.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/tukolelujoturojipanulox.pdfIn PDF document text
    • https://binhvi.com/upload/files/44326275229.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/92309fbb1c27cf9883100d25520f9af4/zowegi.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/zudarekoluwofegusofu.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ahi26p1lskfll49c1u4qgi9gs3/wogadejijegobabavegalivo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b381fbc2cb---tojavabej.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160764409a76d0---vogopaxegonebuvezoruro.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd48e555ba9---tanowujejadaji.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/naserib.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbefa4015---16775495998.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9e216fd879213df8bff53a337b5bd85c/5641417403.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d509a3a82e444a51b43eac9d20f6f37b/30760423050.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbbf411a3---56843895236.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zadopusurovuwizoje.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f41c27c9---feguwijeredujotigejed.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/84723646095.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gemuluvoj.pdfIn PDF document text

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