Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc0d1b8bfba8b6c…

MALICIOUS

PDF

101.2 KB Created: 2021-08-11 19:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 090023e4bb06b62061379a8c62ba3fdf SHA-1: e30c95c37df1c032411415170234be858fb6686e SHA-256: 4cc0d1b8bfba8b6c1a07fd14b04ea928b612457937f5c89c827a00abbeebc9c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8e922945c8485ebab5c88b9bdf1792ca/46226527202.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/23294379079.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/edfeebab054536c6c1e79d415406f6d9/dulusukonis.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/dibezesitukaxabemozux.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e543549592a---74454595080.pdfIn PDF document text
    • https://maturana.cl/upload/file/molejupozoxe.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/bexivurebagim.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160746d18ba7ed---fokoxopuzeboruvukujid.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/vajazozo.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a848c74b3c83f0a04179e641d114ea5e/pamofatilulebijefonef.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17952a01d---sugega.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/30494856558.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/xivitelivewelutigofalakil.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/50426b931066b116142466ad8fdfb8ac/pixojawijiwuw.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/gugatulodajopixel.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/zasejorenisivozoxujikiji.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/bakesometaxitiligitukog.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160967b07db377---fitewegepoxunikavevemi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/08959a2c22658c0db4deb2675d6cfb73/tofinesipewuzudotiped.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/rirelimemagalitijijeni.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/83274091380.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ccc1bcaf0---25338652541.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ekubaofa3ocla3dtvvlip3vnlr/tufuded.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/jifofinaruwujitazar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=undertale+animation+makerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 10340 bytes
SHA-256: 35008750b9a87b886e3f27e2d00fdbed5009524e8dc8f4bf1daf8f9ea38f01a6
font_01_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 19096 bytes
SHA-256: eda8c6ea0e9507767cd5c632d8989bd939d4f48998838038319ddeeb92b10906
font_02_sfnt_off00016307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B14 2320 bytes
SHA-256: 0470d5d814c750595da20e46499b1ee560d88985d0db017df2ee93296bfb91e0