Malicious PDF — malware analysis report

Static analysis result for SHA-256 41539c34a60ef73a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 18:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 399eb96146dca1cb2edf6094aa4f789b SHA-1: 9c522a8133d0dc8d2b49ec1bc5f80a09cc9045e9 SHA-256: 41539c34a60ef73a6a96c80e65afead66830e44e076d3a321fb52ea885bf2d72
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://salt17.com/userfiles/files/fadojetidirev.pdf In PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/63630348038.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e27602581a103ea22a12d197a20f347e/35471148659.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/fanapenedob.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/14628733189.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/kilojelofafikegodowuf.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/16136691492.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed57a32fab---31093986666.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/efa0c22c7bd5691fe0f328fda0f42e37/96264349696.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/97171490569.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109080619325931.pdfIn PDF document text
    • http://precisao.net/files/files/78479874571.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613836f4f0849---xomoja.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/pajunusi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a4a71c1b---vabuxozavawokoru.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/timaxutore.pdfIn PDF document text
    • http://punaide.com/userfiles/files/91844354347.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/219ff57ed40206816de8a1b48a1454a4/86556460729.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/gunekefadidifujurimaposi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8415ae8f6---sejiragidiwatamiwomomu.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/54483515826.pdfIn PDF document text
    • http://freeorden.com/media/file/11367140217.pdfIn PDF document text
    • http://pk.mo/userfiles/file/65493012480.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/jirotufekizinakikevezavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=six+sigma+objective+questions+and+answers+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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 11764 bytes
SHA-256: df103a44c8f80288719c1567804f4616ec31539f73cb07e7bc65e3d474b35326
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 17556 bytes
SHA-256: 27283e3d9f0cb20299727543e3d87cf8246b95222b7846e334243196927d2b2b
font_02_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1