Malicious PDF — malware analysis report

Static analysis result for SHA-256 63859dd102e5f110…

MALICIOUS

PDF

92.9 KB Created: 2021-08-30 13:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3179003345585aa59bc11be5c8b969f4 SHA-1: 80f2f3229278178a8147bf9fd3a3d6e33a51e9a7 SHA-256: 63859dd102e5f1107879c67cb4325a2add5e756bd0c5bc6fff9ac282e687a77d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=altar+of+the+basilica+of+saint+anthony+of+padua PDF link annotation
    • http://geredekombiservisi.com/userfiles/file/43080251765.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/21a98b56749a9e25254a857c71913ff2/konotigelanawinekoxizewar.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/dc3ac0o8rla4ade264cko1b3o3/wusezogenuvatefinavev.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160750e2e67c9e---94161485033.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cff005937---tezepisigogom.pdfIn PDF document text
    • http://redactron.com/userfiles/file/tofazunulasapevoku.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/79363810138.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/gm3sreh5qc0lt2vvpdrn05je74/85030416998.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/nozexolelewabo.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/nakemuxopizu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9a5585e0---50293387625.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11bec5788---48232566368.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/21860743358.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160898a235d2d2---10919660219.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/butogubim.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8adrtgdl0138qsnacq6st33g9n/65438986449.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c2b241861d37fc65f078584b9fd16388/mefuvuwema.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/lobimuro.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609acba25d985---lalawobelofufu.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/32407258133.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/67039316618.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161058ff522cee---21526298976.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ac1asp5k8je5htamrlc28fvkf5/tegobibibedibusudoxadan.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/95481597455.pdfIn PDF document text
    • 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_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 19764 bytes
SHA-256: 72d18e83b6e1b93b4e1453d683a71d2cd1d47f95ce9f3b579ed612d55006f0ab
font_01_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 11052 bytes
SHA-256: 92865fe35cf31d0f6ca439f5af2bb38040859af657f7d3e140b1330365079589
font_02_sfnt_off00014b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1