Malicious PDF — malware analysis report

Static analysis result for SHA-256 278f758a6044188b…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 04:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7024b2254c90b44729a4c925d46a768d SHA-1: 66518d34a234b4c5f813c04f67d3e272176a5879 SHA-256: 278f758a6044188b9d5b750f2774484de06bc8647cecd3bf7e1446f28c2f81be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=how+to+solve+a+system+of+equations+by+graphing+calculator PDF link annotation
    • http://alfonsoguiggiarchitetto.it/userfiles/files/nufojinegiwudifuzukol.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/kovowinojalosilagub.pdfIn PDF document text
    • http://gyliver.ru/files/files/88807773687.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/77776608523.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/velolawozawar.pdfIn PDF document text
    • https://edusfera.pl/upload/file/bilosukaret.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d59fc5e48---molel.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/96914407333.pdfIn PDF document text
    • https://combrooncom.com/contents/files/17161686040.pdfIn PDF document text
    • http://akafgdsgreawy.pretty-match.com/upload/files/kafuvol.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161459eff60e9e---88689228499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a8e00a8c---86394075321.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405b6d23ac9---joditadomutewoxusomew.pdfIn PDF document text
    • https://datenglagi.com/contents/files/luporaxapufagexedawalor.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/4825546579.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/sudekapiwasexuzet.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/96089366884.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/legogajagepo.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/77278933362.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/91814961921.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13f1d1ddc---dojoponenebaj.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/kodusaralu.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/lesesuzogepude.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/befexazexinenimidifabu.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/dikibitorefozor.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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 11572 bytes
SHA-256: 3e1fdbd389f2174bb1f692fc4d62fb4ded4e1d9676109021cd814591bf219839
font_01_sfnt_off0000cc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 16080 bytes
SHA-256: 0e07f2eb0f66144290f11740d3e2b4e50655800ab7df43a383b6baceb33088b1
font_02_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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