Malicious PDF — malware analysis report

Static analysis result for SHA-256 30256466e39d7785…

MALICIOUS

PDF

71.7 KB Created: 2021-09-15 03:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e198b6f271850344fa9f3e318ae3627d SHA-1: c782c88bde312dd796c9759e10c412641326020c SHA-256: 30256466e39d77853fd4aac3eb26c994355e2ff974de9169202b77df927511cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to potentially compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://studiogiovannone.com/userfiles/files/savuvunom.pdf In PDF document text
    • https://natinsel.com/imagenes/file/nawodawel.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/21636409575.pdfIn PDF document text
    • http://pinxedien.net/upload/files/99599766998.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/20090546509.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912170602.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/gevukagarude.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/bekuwonuzofe.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3f84ff4c539631ec56af88d44cda905c/27102963902.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/40315293183.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wupojemeni.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161413ac6587cb---96521754374.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/74262202193.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/745ee7fbd1165cde1e463ed22e1397c5/vunavalubival.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/nosavedorokagobotiwozef.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/tifawetowitoponusarigi.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/sitepabi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53ca14f64---jenugetosutu.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/7801603535.pdfIn PDF document text
    • https://dukupahit.com/contents/files/7488648184.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/nelamujirut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ajoy+ghatak+quantum+mechanics+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_off0000b5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DA 11484 bytes
SHA-256: 4d2179da07d0173aca6133aba39e0c3acb5f0c86a1e2a724e0edc2ff015d6f56
font_01_sfnt_off0000d05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05B 16004 bytes
SHA-256: 157998b5d7f46d337aae7fca7727f60846863907d91a301c6d9e6a88d3a7683e
font_02_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1