Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52b3380d00bca4d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-14 13:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2aaa9421cd80987b5032b1738dd887e4 SHA-1: 7e2ba2859ccc9b8c8e1727b7d5c61560911b1b5d SHA-256: b52b3380d00bca4d5660fc24419f3a24c91300f409352e552e488dfc63e08df3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics indicate the presence of embedded JavaScript and a link farm structure, suggesting it is designed to redirect users to compromised websites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infotechloyalty.com/bot/ckfinder/uf/files/mapelubit.pdf In PDF document text
    • https://foundryindia.org/userfiles/file/kevinesobason.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ivdrdeabukbm3ger60ps6p1qn5/69906969626.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/9576945384.pdfIn PDF document text
    • https://togeltop.net/contents/files/gemat.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsbdlifav017ik4cso4c5ivab0/27985421508.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/wokalabulivok.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/24409345968.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/53743365282.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/43987060026.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/67135765856.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/zoxogemikatumajisovubodo.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/nuzopilinumavedawolu.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/21914623543.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/jejifixoxumajitoja.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/jigimujo.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/repumodubituta.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613abdfa05de1---voxaf.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/sedok.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613765ea23b98---rizametoze.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/24767854287.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/dafevosabojabavozadaxu.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/75783568213.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314242be21d---soluwinuzujem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=where+can+i+watch+friday+the+13thPDF 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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 15188 bytes
SHA-256: bafae7c293c3d2c781de6b69024ea4817f165b585e35083746b73a57762d486a
font_01_sfnt_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10656 bytes
SHA-256: 6d4aa562ec8b18e934f3d02dd1dc89068cf58ee5145b8e130053601053750247

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