Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df8754ee90e2d6f…

MALICIOUS

PDF

74.2 KB Created: 2021-08-13 09:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3f226e2cd5c4084136bfb5f8f50c504 SHA-1: 1734ad7237f751477f4545a46cd9532afd2e7bb9 SHA-256: 4df8754ee90e2d6fab03fd4780537f75bd79d561ca99617639fcf3c597b7d3a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external URIs strongly suggest it is used as a lure to deliver a secondary payload or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3a59cfb09a773a463c30b325cd0648b2/64308037374.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e673861bb---15824727086.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/nujivazemifiligejok.pdfIn PDF document text
    • https://bliznacite.com/files/goxigobipifowibojazaxi.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tunokutelojatalijas.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/mirafuwujepo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7b37c65bfa38c28c1bfbb50657fc43b8/meparozukezetokuronufeval.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cf3d2eabfe6839127955c165c29e7b03/furaluwuzugiperiwu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ea7996c92f13ebd4f7bd98d4ed710656/78181544013.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ifejmtjm557v39d9j6p48rfbq2/dokevibifalarisaneti.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5427fecd---56231535201.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jisug.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17096487350.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c95d275ce90f318bbdf6225127efca1a/60777629507.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa137848090---70634472445.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832115f75c---14138214094.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/jojulaforila.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8a74d3c9---gabatozotuwa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2f5de36a0c79f06137f5ca224e16e2a8/8532367643.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/25641688048.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18de800f87---xivetoriserajunifomoron.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/75649585484.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/31408129517.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16099bb278b22b---tuxov.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/nlg306182464ba9juqp7e3qis1/15225022374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=is+belgard+a+good+paverPDF 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_off0000c0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C4 16452 bytes
SHA-256: b0f4cba20597e32e87a5cb6cae5773b1022771386a22c6794c268147a7837a4a
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 10432 bytes
SHA-256: 305e500be8585b120c1c753ad85b92c505f38f215d74c5b40b67528ecfe1cac0

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