Malicious PDF — malware analysis report

Static analysis result for SHA-256 9159bc026b09cf25…

MALICIOUS

PDF

86.0 KB Created: 2021-07-20 13:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d40926f9fb78cd7a4ea77deea97d73ce SHA-1: acd5224442e31fdfd629bde31894e9f310af7472 SHA-256: 9159bc026b09cf25cf17fd75390c89a850ae8484a53e9a10c13d5dc582f0d2b0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.advokat.com/app/webroot/img/fck/file/21539305075.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/4239966de22eccc8a6a1c7113baac5b7/filuxofut.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609212556e5c3---75789647454.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/2vu4lnjmej39r6mbfvpmitc7tb/pimujuw.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/juzifij.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/tififelekebiledalifidaju.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/766a0166bf3ba0a689ed765e1424194a/gikusonitatasopepidu.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/vumagutukub.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/fomazepomepegewas.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/turibaf.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zafuzifug.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/80765124517.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa316240f7---99770851981.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/2e8481ed6b03c900bb0f9ba74b876700/zubuwitaregudavibotisije.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fokanigupifudadesitat.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/lobijili.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b0243292f---tosumapa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b312a3fe2e---59549506643.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/dexivikamilemosogab.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17efe3424---pefibifekiwedidimaduz.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f700685fa79b9fb73d8d754103504bb0/keromororisunurak.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/5658239717.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/tiboveloveziwi.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/jetesaliwufig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=meghan+with+archiePDF 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_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 10252 bytes
SHA-256: 0f26b63d9dcd751850ddb9b7e55c5353145de6b33f76ed134debd5cc8ee691ae
font_01_sfnt_off000105d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D8 17180 bytes
SHA-256: daef09ffa9bb77e3b5b2d6c1d2ec003c3a9fd21c5c17aebfe1e8d8a1a401515b
font_02_sfnt_off000132c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1