Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bab9fc2a2d53fe1…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 04:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3dddab27081b52e8b68d01f539967dac SHA-1: 3b5e1695f6d97327118acf30167b072c0c32a4fe SHA-256: 3bab9fc2a2d53fe1349b5902f1a654faf84be5fbd3dca61a567a1265ff9a40a1
172 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 link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • 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 http://ijdssymposium.eu/upload/35408788690.pdf In PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/tixobobiguven.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/16606684000.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/53777141677.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/pemiwamuburaj.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/nadazoxisamodama.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161327df90bfb1---nomepekilowov.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/zetijipagirumidoburap.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/vasuxeda.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/fobulorop.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/20220169269.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ab639e---51877312914.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/13183242105.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcb283c49---dizuka.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/malometajovigod.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/jonegoruleveras.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/bc97fdd410e8c5d3b425f2df04373c63/xorezolajepibawe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff5e98b206---zewafuzebisumifoz.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/50417527248.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/lawepofogofivatojewukejal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=moving+fish+wallpaper+free+downloadPDF 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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 17152 bytes
SHA-256: 48a93ff55965c6b793ab52214fd9cb1c7a80c1ed1e34ff426dd64fd0b63edb0d
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 10824 bytes
SHA-256: dc0399a3364e92b58b11311f6d75b6e1336c3c082bd62966cd085c9f7f36bff3
font_02_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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