Malicious PDF — malware analysis report

Static analysis result for SHA-256 463c49b19600edd2…

MALICIOUS

PDF

75.6 KB Created: 2021-10-12 02:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 945c8616a9758a51733a5b0e6ed05a8c SHA-1: cb858e62861610ea7ff2ff9d16b1a07be5b30a7d SHA-256: 463c49b19600edd2a86edd0420ec49ac1e86e703c003c8a4a5fda1da71952d4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

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
  • 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://artgallery.devctn.com/ckfinder/userfiles/files/garurij.pdf In PDF document text
    • http://myjobcareer.net/userfiles/file/2021090620030073499.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/liginegoganerunuba.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132e92f659cb---zuzenupokinules.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/zexajejadajopuvujuzoxi.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/74100539485.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/kavekukisiwodolewaj.pdfIn PDF document text
    • https://nepaltravelsandtrekking.com/userfiles/file/vazewagopogivabexijufexa.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/nokixetalulowo.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/damifajorare.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/30864758112.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1615cf00015e29---winigi.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/8083441755.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/minemovusemutamawevupawug.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nukipoxuboligapika.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/36171619487.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/xolumokonegowutobixaj.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902192744651753.pdfIn PDF document text
    • http://annabarons.lv/files/files/20592183583.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/winigapuxobogunejevafe.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615b16c54865b---25925367111.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/nixevulosopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=d%26d+in+spacePDF 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_off0000bd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6C 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000d011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 21652 bytes
SHA-256: a1cd83e8aeeea35bc6323c854dbcd135da8adf54558300950be3a33f21a5401e