Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f9c019cf453b4c…

MALICIOUS

PDF

88.7 KB Created: 2021-10-07 01:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b6025f3422c4a7fb7971345ca7a55b7 SHA-1: 8d6af38bf04b53356748467e6fc7eb009acf2345 SHA-256: 44f9c019cf453b4c2c4ef2d0969dd2e55de4e626065ac3568307f3eed583d301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e335603a---10395140611.pdf In PDF document text
    • http://mascotdd.com/file_media/file_image/file/2021640050.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1632833238.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/83425842898.pdfIn PDF document text
    • http://goref.ru/files/file/jeluza.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/19973030520.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/11387988046.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/47544882987.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/dibam.pdfIn PDF document text
    • http://climtech.com/files/files/rosuto.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/zupipubokigekodukeroje.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/perexik.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/65740825018.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/28722644510.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/16125174997.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/98307952010.pdfIn PDF document text
    • http://abworder.com/uploads/files/48353370906.pdfIn PDF document text
    • http://greenld.com/userfiles/81972655782.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d4404d23625bfb23a0739d41b00ea8ef/vogisakexi.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/gaxixozebasefuratotofemug.pdfIn PDF document text
    • http://hiddengemsbookstore.com/userfiles/file/23502296338.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/fomatelovogutawubowol.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/tipilarab.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/pujezitawamimow.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395df8d8812---zisezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=subject+complement+finderPDF 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_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10896 bytes
SHA-256: 12b0bcc18322a4e58ae9b9270d3451c916d5f55352d9bd09696a33572d4db160
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 20396 bytes
SHA-256: 348289c743baf40ec725499474f86cd20dd68ff47b24d5c01f1eba6153db77b8