Malicious PDF — malware analysis report

Static analysis result for SHA-256 990797c88cd5e40c…

MALICIOUS

PDF

91.1 KB Created: 2021-08-01 11:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fbb126e4a02d219c368e70efa7a2d3be SHA-1: a639f004afdf48a1d1782766ad5aa2d0c70c5995 SHA-256: 990797c88cd5e40cf81e2d1a62be2d8800a8293fe79eb1187cf6e84962610055
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple URLs pointing to potentially compromised or disposable hosting. Heuristics indicate a link farm and a compromised CMS upload, suggesting the document is designed to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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 http://dgjst.com/upfile/file/gewapikobubiropabepose.pdf In PDF document text
    • http://alemotta.com/resources/original/file/vagegolubemig.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/25940815795.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080333578c1b---39952066454.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160820de8228b7---xenuvul.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160814b47ca79f---tonapixo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc667784232---bamovulezuzojozubi.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/61987327780.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/78486932649.pdfIn PDF document text
    • https://digireg.dk/upload/38593551878.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/68167674546.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/radenupowutef.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7c043c0bfef752a52e36ce9b1661b2b7/50893378037.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1341e90f40d8eb1ca077029e8983b383/30314819983.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09397e34b---wamazadinuwizodiwizixetod.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/51421969278.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e141b484a7a---48224397710.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b8001cc1f91---77937761070.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/57261775411.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/64875187109.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cmsr77jufi8geir0d2r0no9kp7/putakib.pdfIn PDF document text
    • https://ancoraeducacion.com/images/digodijozoperimomep.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/73177326327.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6ff93ef11e11146ad77e139ddceddcfb/riwivod.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160889774e5113---91323425311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ver+o+filme+doce+novembro+dublado+e+completoPDF 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_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 20404 bytes
SHA-256: b4760d8652cba1efb452ae3f93f0c535cd43b3422d5203f48912eab949bab1ab
font_01_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14268 10888 bytes
SHA-256: 1a94b208e393e5a695f6f1b03a3507fe442318577f79008d803afe42a1db7204