Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93ef08cdd239fce…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 18:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a5eafb8bdb0351a697e234fccb6c195 SHA-1: 6be65577c7da9ad67bc3b6026546fcfb8523c8a1 SHA-256: e93ef08cdd239fce7e4e5d47bde3a6c7c7cc4ee6e3a30ffcf342dd86a0dd52d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://asavn.vn/uploads/userfiles/files/wijisaliv.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rpb8ar1ee7k279f5bjsiq942hr/5170073134.pdf
    • http://sunnyten.net/userData/board/file/28999452123.pdf
    • http://closehorses.com/userfiles/file/romuzivimaxetivamazunogoz.pdf
    • http://capital96.com/userfiles/file/76756590519.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb7921e54658953cb0815c9db3dc23fc/bozokif.pdf
    • http://studiopetrilli.it/userfiles/files/fakozi.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/50563492853.pdf
    • https://psfund.org/public/uploads/files/cms_files/vuzego.pdf
    • http://wolfpackbasketballacademy.com/content_docs/55640345576.pdf
    • http://faceconnects.com/ci/userfiles/files/10122026519.pdf
    • https://promoform.coreform.it/uploads/file/24972476367.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/9670378067.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a5d3bb1b00e44a2293242f0ec75a43f3/91119166954.pdf
    • http://huh.hu/UserFiles/File/74064577050.pdf
    • http://tochuchoinghi.org/files/39423935593.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/72782753620.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6884599701.pdf
    • http://needychild.org/ckfinder/userfiles/files/doxedanulosifubiwalub.pdf
    • https://vwb.mrv-educationservices.com/content_file/files/22574543276.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142000dea935---runemoguvapow.pdf
    • http://balone.net/_upload/file///zozinujopijogewid.pdf
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/87306332994.pdf
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/gatokavigadowezedap.pdf
    • http://www.biosafety.biz/ckfinder/userfiles/files/46423646371.pdf
    • http://talcmanagement.com/uploaded_files/userfiles/files/83010972550.pdf
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/66205065751.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=revelation+study+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d1.bin
c307f075aa126a52a618360be752e8f1a009da69da1bed9b7c1c584208b97f4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10716 bytes
font_01_sfnt_off0000fb98.bin
4482ce70fccd12401cf03282abcad79dda204b4eeab01b1e315e05b0fc5a494a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 18104 bytes
font_02_sfnt_off00012990.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 16792 bytes