Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb746e496801ef7…

MALICIOUS

PDF

101.4 KB Created: 2021-09-15 19:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a9b98811f2eed50b758eaa7aba382b3 SHA-1: 71b64b22e663160206b2448f13ff931e355148d4 SHA-256: 2fb746e496801ef7bf2210f6402cbfe19852499315ce9d37cd2f94168f2d4d67
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to initiate malicious actions within PDF documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/71583528245.pdf In PDF document text
    • https://rubenferro.com/userfiles/file/jinesegerujerivitokoze.pdfIn PDF document text
    • http://kdekdyjak.cz/data/fovedekepujokojinumobep.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1d370abfba505fdd9a743b71df0999a4/76187298067.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613613245953b---tanopogufuwivepomag.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/78966967786.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/93527769165.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/4620610341.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/bototumutanurajatifu.pdfIn PDF document text
    • http://www.bash.cl/media/file/24021754012.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ae26e0d1c14ab84dbf3791b27b6bfc20/zupunobiwewovol.pdfIn PDF document text
    • https://renetravel.ro/images/files/kezajibilefow.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/masetino.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vlpd1d9fgf9m4mpar94qs1g0tp/34328433691.pdfIn PDF document text
    • http://sdes.in/uploads/4219658628.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2e500fba2bb74224c32d7eebbee5676c/63232933685.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/ravijatu.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/ruduvobu.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/15552841116.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/99648423979.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/7750549396.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/baxesideviwasol.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/5716886923.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/tutoli.pdfIn PDF document text
    • http://willbramephotography.com/91839011029.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/kipebuzuturimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+amazing+spider+man+ps4+game+download+for+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_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 22088 bytes
SHA-256: 2c34c201e091e63210ba0326ee888ffe42c3e3f8983f51ab56b7e7427faf86c5
font_02_sfnt_off00016dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC3 11036 bytes
SHA-256: 99364c68df0541a494a0d05c089d72122980949096328a64833bcddfc7ffe044

Open this report in the interactive analyzer, or submit your own file for analysis.