Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed9d2895f11f304…

MALICIOUS

PDF

39.4 KB Created: 2021-09-14 09:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e5a441c472d5f572b93ee7eea54e0d65 SHA-1: 9539ad5d94861273957adda10181de379948e90d SHA-256: 4ed9d2895f11f30437c03b6089b19b13d4f95611486a8b7d22757499cbedca39
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, utilizing an image-only design with a clickable action to direct users to external URLs. Several heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the overall structure points towards a malicious intent to deceive users, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8883

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/804342386.pdf In PDF document text
    • http://osc-pribor.ru/products_pictures/file/12273076117.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/saxegaj.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/38574688534.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pidibezip.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/sejogafidaruzabisesova.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6iho07flds1nftrvuescqeidfb/7614532580.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a5e98506b6196d2f1c24131a1f278feb/23360905812.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe922b74c---14696384130.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/26241501453.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630900492_1.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/tajafepidufit.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/76414785492.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/62590781223.pdfIn PDF document text
    • https://guijek.com/userfiles/file/xutevofipanalirosimowipo.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/67449635770.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0cbe09ee1---94837685464.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/uIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=change+font+on+messages+androidPDF link annotation

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