Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfd51a2d95c34f8…

MALICIOUS

PDF

96.6 KB Created: 2021-09-06 14:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84766cc737c091c0480f6e2461e5602d SHA-1: 82e2b8f105e1c1d44c0648c70ec90413b64e18c9 SHA-256: 4dfd51a2d95c34f886b9c5a6fd77460881031c1b7130fd4e3ec6ac1f1658279b
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. The primary function appears to be redirecting users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28fcb4ddeb---81229643677.pdf In PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/silofudikav.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/28f03fc5ca376a31000367102e7a9f96/xulotagizoridodejazum.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bac689dfd60bd6a251d01670353408eb/pebobesizewuviloxov.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f1f08c7b2d82e59e8271b524385c487/78774876809.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/51174697723.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/20400507527.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/cf68827d73ef9b37fe30e2c40d747dc7/29729396336.pdfIn PDF document text
    • http://tano-cable.com/d/files/23883159023.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/gadojamifura.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/koxim.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/f39k1qdrvpc81ig2oh9i8jgh9f/vudotuku.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/6831166233.pdfIn PDF document text
    • http://4bx.pl/public/file/jugebolusixezesil.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/69651721376.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b76a24cc---14943704905.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/470eddfabce34c2f1c71eeabb5cec57a/81597310247.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/36b2946cbd79529ed8e3887afc31ccf5/zaxafogubukuxim.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/98697800013.pdfIn PDF document text
    • http://ustunongel.com/image/files/42650500162.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4b15caf8c0a5a9f0c94f9aba9ec4d7e1/fobumorogotebejoweseku.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/164c88347057e4d7b1c6369bca02af9c/11702728676.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/vexubejalojulopire.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b498a75a01a---75333077138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=anatomage+table+user+manualPDF 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_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 10580 bytes
SHA-256: 023b3cef3c38a3e801e58d292a7480dc2f7d2969e50421737899df141e2e4d8a
font_01_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 19512 bytes
SHA-256: 82050ec4fb6230bb84f2d597c405a5bdbd7920500c21ef6268bcbb4e10f5a716
font_02_sfnt_off00015b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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