Malicious PDF — malware analysis report

Static analysis result for SHA-256 a472f9353ae2e8c3…

MALICIOUS

PDF

91.6 KB Created: 2021-09-10 17:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae390c5878c8a18d5fcec5b7b27842b3 SHA-1: 3a87dda69563830c51e8fef0bb384726678618c0 SHA-256: a472f9353ae2e8c371705efa2337c83787838d11df2bc7c24bc61e20f651f137
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/7c0ee363e060c7270f775a72cb59d85e/39142512652.pdf In PDF document text
    • http://tapestry.cz/images/file/files/duralaxosufibukarufubex.pdfIn PDF document text
    • http://schokozentrale.de/idata/repumof.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/bofavuwukewuwamewilired.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/tigexaxapavi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea96b9a13e---faporivekewu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602f492f64---39488437138.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/87785368834.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/dovijufigamaxasevajar.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/tiduwaf.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/19713603535.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jizevifetipamozokez.pdfIn macro / runtime command snippet
    • http://thevisionkharj.com/userfiles/files/vokojaduzadibagosegube.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/91305018770.pdfIn PDF document text
    • http://bienbao.org/uploads/files/mewesupemenebazitizogib.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/jawisujadilib.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/52180181861.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/niv6c8gq2fi61tsoqjrmjptv5o/40192007081.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://hometeamcorp.com/images/usr/butotasedetisawowegipuwal.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aecca25b81---kugiminonedakinuzin.pdfIn PDF document text
    • https://finliz.lt/i/File/weridefazudevewaxi.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/rolifipo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/raziridagumen.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/3378067666.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/pakadogitafenakipapejakiv.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/mozojedetudupolagubanoz.pdfIn PDF document text
    • http://www.ernakulamarchdioIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+4+os+versionPDF 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_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 19768 bytes
SHA-256: e1ed41b41cefe91bdef5813224d37d86907667e828b95ace247d91d3d3fddb62
font_01_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14939 10392 bytes
SHA-256: dd6db27806645fa0835a0f6040a168c4d8cf75ffb38715920002e707662845ea

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