Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a49dfdaa2cd5447…

MALICIOUS

PDF

81.8 KB Created: 2021-08-18 12:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a544ad97233c39c86d796347c4312400 SHA-1: 9e741c2dda2fcffdfd82549d7d735f5485b2f67d SHA-256: 8a49dfdaa2cd544741421a6e4af9ca5ba1db1801b3e77fb1a81886d20c3ebac7
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised CMS uploads and disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tomasmrazek.cz/userfiles/file/69047241134.pdf In PDF document text
    • http://modero.vn/upload/files/94543394504.pdfIn PDF document text
    • https://svltv.in/userfiles/files/gunafegixoz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/b4nog95dsv2d976gfj7rp87j2a/63796368547.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/30453981355.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9a80efeabb0103b8581a20d99662a90e/logowe.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc1b421ea---82080206567.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/46746760533.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/7224287625.pdfIn PDF document text
    • http://contelex.it/userfiles/files/xugalinagefuwifibew.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/51094514733.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/gumivosudo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nivejarekovuvixiru.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/97958627443.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/54408269016.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/wijoxozena.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/radugarupezusikabadebe.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/63277170814.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/3af2f721df7cd7fca53e2c4f8b01eba5/85409367377.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608011bb8fb9a---47064483895.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4901434c---xavaligagupemikasapebufar.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/44809258394.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/7155022608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jeppesen+a%26p+technician+general+textbook+free+downloadPDF 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_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 18144 bytes
SHA-256: 75661b82a4451bc1da043fc1f52c1eddcd46485e9943cb7d263da80929fcd675
font_01_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 9780 bytes
SHA-256: b3d06c00478cdaeab8055806555ebe52b65506a5143e969dd194bd7993cc5d0d
font_02_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1