Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab05f34d517fdfd…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 19:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 003be4569b89668e5d1f63dacc04a47c SHA-1: bbbd6de9c774018a327adbdcefb7a1cb6fad6946 SHA-256: eab05f34d517fdfdfb37d16601ea0ba124f591b62da3b8508ecda742d34f346b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=critical+thinking+math+questions+for+grade+4 PDF link annotation
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49708ab56---67222808073.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5e703c97---lenuxasegafezovasowuxot.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/xabotiponiladesuvovasu.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/fasivulazovojemasuzudusob.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/47647520064.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/fawufinewut.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/rerimepozi.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/64268766007.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/negoguzamefufefulo.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fazonuxulalijusi.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/99866308237.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/80394136242.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/zezugabudodarupogadesu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/f731o9mdkur8uq5m2fh6lva2p3/mexegigijalevufiwis.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a3178c955b02b7fce0de57ecbdcc17c/50026240131.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/feseboludedovijotowuj.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072884feda4e---23078680695.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c429b4bd4747517241d094c45102bcfb/tazuso.pdfIn PDF document text
    • http://firegallery.ru/img/upload/fisexexavipapajebu.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/retakok.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_off0000b5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 15592 bytes
SHA-256: fdb0eb887a548e933e0cb1e3cfa04e6bbc20c694b9623fb3574912526da08ce3
font_01_sfnt_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 11372 bytes
SHA-256: 42fc77783dd7b9d12223b0b55b08dcd91cc42941ff4a0966f6df02ac6f407da4
font_02_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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