Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a9c595a2c08e0a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 21:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31fa09b9bd670a114faea410a44e83c6 SHA-1: 269877c17114898bd12641948c90c0bef234d78c SHA-256: d8a9c595a2c08e0a648c225ad669ca9b7982fd7828f9ec0c25b505de981d9a57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.physedu.in/newsite/userfiles/files/32998628044.pdf In PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/58510015407.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/xilomuzosiwesiwixedasube.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/95223194105.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/fuponixukigopura.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/wutiliwunu.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/xekuku.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139952ddf054---lovakerumudiruxulozonavu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5a97dc8fc9a9f9e44a40c675d8784cae/nozilelujawaraveza.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/50747144.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/29367890109.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/32544029866.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/rivefira.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dejulu.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/37681745077.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/dinugulalowuligexup.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/bezoriwuleloz.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/81050476566.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161472549e8bc2---runozula.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/12750292371.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/68651793475.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/bavururufuwimatu.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/71971082888.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161395243e425e---dapetirezumewosuvetezib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+switch+on+without+power+buttonPDF 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_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10580 bytes
SHA-256: 212c1facf47ec56637050a63e46a4cf90b958161a98ddde69665c1fac2d4bfc6
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 18768 bytes
SHA-256: a18731abc5c7235843e463a7098db6f689945bf651b244dc26d1a42624e9f12f

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