Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2ab7a6339446e6…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 15:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bc384aa0d5e1f53caa619d9fe2023cf SHA-1: addd701ab7d70295fc131a1bc9598a89eaa31662 SHA-256: cb2ab7a6339446e6cb4d4dc8b3023c7f102a233a9517cbeaa027a674e1d44e05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript may be used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=best+games+under+50mb+offline PDF link annotation
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4f018fb79c8370af43d77b7e390f84b6/nenepabuwekajubanuxebod.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/39558340414.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142234f4ab2d---jutuzukupimajanojujiz.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/fokigasedezuxe.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/mifux.pdfIn PDF document text
    • http://air-ned.com/uploads/files/xojipake.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6158be624bcefa3ad34a00bba6473db0/12744986543.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/34232468152.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vaxebijasuxina.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mijupifosatarugofamiwir.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nanakavukuzi.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/86664026252.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/35050250893.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/kepuzewowuzowisukiladalag.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210916125021.pdfIn PDF document text
    • https://empresa-venta.hr/files/jowuve.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/dogetatujupos.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/47826496411.pdfIn PDF document text
    • http://foxadv.net/file/satibinuxoran.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210904141906907.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/91428014782.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140cad3815b5---nakowagopoporiw.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/munoza.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/45578785509.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/10962943715.pdfIn PDF document text
    • 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_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 11248 bytes
SHA-256: 8ecfba71abb45807fbe8a9e187fdeacbef9f6c95b691b06a3c56c87d19f9c4b3
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 17420 bytes
SHA-256: 83a00a9837dfb4851ace233a751855c16ec80606302efeac647092b308529c3a

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