Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4971f98071f3aad…

MALICIOUS

PDF

68.7 KB Created: 2021-09-07 22:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad2600a0aa267ad852a5688092ce9f05 SHA-1: deef1b3990d7a9f7745b6e755bcf02af6de6688c SHA-256: b4971f98071f3aad8f8f820da95353a45b8eabd4fa32d4b2c62f76f95e3d1f83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection to these external URLs, aiming to deliver a malicious payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://virtualpulse.eu/UserFiles/file/64207513587.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qsjp1pc6gjit08lkphb99j78qe/76511289034.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/40733915948.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/19356767804.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/90181032728.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/21305825385.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/11609106136.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/63268362011.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/4vor04adl1b72kdiqos601ovpp/fagarezikitoruwuluzil.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/toxejawerekiputexukozizog.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f3be6fb75af9661402bfdd2e914e4dd8/58017582488.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/isdmmdqs0pulqp4mjflgfg8keo/99968637260.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4340c17379---95595152741.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/uis80v2vg2tfpr5jq5dos4ef7n/gefamonovuzeli.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vrnudltcn8p4r2ua6pptc3m07i/ledixinezatobaw.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/77721478704.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/sariwulebafabirunazuxava.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609eaacecda4c---11417375513.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/jilozakajafagalunit.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/61512039555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=astm+a537+class+1+pdfPDF 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_off0000b13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 10624 bytes
SHA-256: 863cc414f333d8360738512268d945f43dba51f459dba9ca06b095e16202db2f
font_02_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 14324 bytes
SHA-256: b14e993727c481958869755ff67c6137cf89a21f0fc3ccb4c85e96c5afb9dee9