Malicious PDF — malware analysis report

Static analysis result for SHA-256 85feecf0e5d0ce02…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 03:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6995a07008155e9b807e9b7a4fbd186 SHA-1: 2b6e68493ae4c7f82e2e48284815ed65858409b7 SHA-256: 85feecf0e5d0ce02d3af1c9cd1f5774b1ba95adffa3c2876c0bf722df5baa6f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04f5a6f29---puteboruwopaberure.pdf In PDF document text
    • http://kalmi.ru/upfiles/files/vokiz.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/25645942720.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/dujibekujekufo.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/lefuzusosudopi.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/napesuwudeko.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce39402771---51517133918.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/61985696734.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/wirunamofevibob.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/lulurugakamidide.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394af41bc92---35685431085.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/98507826905.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/0db9b813d1f115b863b1991b6271e763/bunujiz.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f431a24dda---nelosulo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115a2248dd---14332154235.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/kakulepijan.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/5703733773.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210918_56CCCF0090095D85.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/12443743088.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/mivexuwe.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/25993948900.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/39790984522.pdfIn PDF document text
    • http://etkenkalip.com/files/54504961206.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/16168704584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+epic+of+gilgamesh+full+text+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 18432 bytes
SHA-256: b1216f3ce8a641153f67ee519b90f92519fb00ab09ff9445ad54a09123826779
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 11028 bytes
SHA-256: 3871a911e75aaabec5a3542d8335e6bcb1f2fc74854a22e72c20f7639912166f
font_02_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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