Malicious PDF — malware analysis report

Static analysis result for SHA-256 914a407ce3e818d0…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 15:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8da5fd121eb8c71bff1038404bb97d60 SHA-1: d71d318e2c05ca71f7c3921156a6d2da8d8c4767 SHA-256: 914a407ce3e818d0252e3c3606e45b49261cccc83a1f4b000a7f59c893fbfddf
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. It contains numerous links, many pointing to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.agcontraincendios.es/ckfinder/userfiles/files/55761609130.pdf In PDF document text
    • http://sethhukumchandschool.com/userfiles/file/55810193391.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/18882293190.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614122b515a8f---22368894546.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/27576382708.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/83806979983.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/9633580255.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/gupavoduwapojenujilop.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/32668023384.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109160353576230.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/41157425026.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/vawebakuk.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/nebedigafobixajatonufu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/15938481029.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/80443691844.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/gonuduxi.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zuweroxusires.pdfIn PDF document text
    • https://fishboat.hr/files/55855132119.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/24909356731.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/675d4819dee6355638c37515bdab605b/vetasokepa.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/299d3facd31fbbda67144499c34f6499/16299482820.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902014631.pdfIn PDF document text
    • http://firegallery.ru/img/upload/pijalobupukaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=plant+vs+zombies+mod+apk+free+downloadPDF 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_off0000ba65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA65 11104 bytes
SHA-256: 80dd60b4b3c921791d6db8f93aceaa04da1c51b1216b005466b81f596be86f95
font_01_sfnt_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 20448 bytes
SHA-256: eb85f4450cb821eec1511e62d3bf33f4f5ad6bc28cb518d3e445c8090abc6a53