Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a36963230774e9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 00:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e06e2d8f74c62ca4560d8b1570521df0 SHA-1: 6001b02f4bd77fa184a3e456ee827ceb58bf9f3d SHA-256: b4a36963230774e99632f48c8cb181e0e95774b3f704c01dbba603bc35f0c2cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update, a common method for credential theft or malware installation. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript or other embedded content to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://antifftech.com/uploadfile/file///2021090916294028.pdf In PDF document text
    • https://sukienmiennam.com/userupload/files/952345336.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613524546c315---64234163495.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/20928196053.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/waxetejupukim.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161320bae3d311---xofatudosuru.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/90533592958.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vigafobigapo.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/40068961721.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/32944898664.pdfIn PDF document text
    • https://teamcode.net/upload/files/nebirusafozojivafi.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/xezuveji.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c7ee65d358f6fcab9be93b93bbd24ea3/wumixidojer.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/91520431759.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/xojebozaf.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613022c7ed30e---nejoj.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/warir.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/57669737948.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/94364247289.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/jewizigixum.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/giwuwapowi.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/80778336544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bluewin+mail+sur+androidPDF 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_off0000c7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DE 17868 bytes
SHA-256: 2e2f945e6c53de7dce2bfea11eeeeea983004269fc84ac865f0f017314f47595
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 10548 bytes
SHA-256: 791929cd9ecd47993e63ba3547eb5631d0424b707a6e3a10b90deafc8cc73809

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