Malicious PDF — malware analysis report

Static analysis result for SHA-256 5372a9032a29e993…

MALICIOUS

PDF

48.1 KB Created: 2021-09-12 16:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45316589ab2742cd680a3d88c87c2b6b SHA-1: 23c6cf92e7a0a95c41f896132118048fdad621bc SHA-256: 5372a9032a29e9933b2767b673c7f85871290eb3bb916241017c3068e34c6d7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

Heuristics 5

  • 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.
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d30697d0---fosanonone.pdf In PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/mivojuba.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/74505928882.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/fenolofuvudas.pdfIn PDF document text
    • https://izometal.net/mm/file/74854700495.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/zobagirak.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7882edca4693c9769331ca7f72ebeb06/55488717323.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/japufegu.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/55402603694.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16132db2f61c93---45859024397.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/27785644946.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sanudaxixovaxegu.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/48008346577.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/xekirijakopenaxusalemose.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/mosujegobudetomakov.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/vokokakixidip.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c1068fe7998cce43165dc121987480ef/81379514840.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab90e243d---19531751150.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/poputudegibilesexi.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/25722514750.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vorosud.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/26914b07728132ab129d174602f37e29/37618281360.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/tuwukesozeneguku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+wisdom+of+insecurity+free+pdfPDF link annotation

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