Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65a134e7924ffab…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bda13d5041aeeecd391dab8bcfd1b18 SHA-1: 7d9ccc27474f6333bcf43ae0fafb1f706e49d7cd SHA-256: d65a134e7924ffabcd74f7e2dfd056694fb3a565690971108bcea5b1273fe58d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, preventing a detailed analysis of its specific lure, but the overall structure points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://king-ber.com/UploadFiles/file/20210905084813778.pdf In PDF document text
    • http://tageedesign.com/ssmpt/documents/file/55602070115.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/nadenovurojeviguloxeribu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/1fvjgd58pihvivd1ndiiuhbrn4/22134337878.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903093052446997.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/23b0084651ced6e2f0deff3ae0264798/2721464546.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/niwatijesod.pdfIn PDF document text
    • http://axwelindia.com/uploads/jifisur.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/46248974266.pdfIn PDF document text
    • https://harmony.im/userfiles/file/bedogatu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/pabibininokelosiledipeva.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/43903674732.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/felezava.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/55341407627.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/gotinakizesukusenemu.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/70851793158.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/ligarowanamomazibaxepejob.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2ae1f8a2---kivurevavaxuge.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/65578627477.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161330be724534---68500952173.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/j9muj2j07jh8prd14blued15hc/sesaparawokobowal.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/dutifegugebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=employment+offer+acceptance+letterPDF 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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 10476 bytes
SHA-256: 85c90488fef84c72b18ec733fbd47471bcfc2ef4defcdf83620b5e69e9b58f6f
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 18064 bytes
SHA-256: d04940a08c1c479f4a2597a56214334f1cfcd41ab43239b345360533dd821c6f
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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