Malicious PDF — malware analysis report

Static analysis result for SHA-256 961db7fe3778e7db…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 21:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 580410043ee2550ba893abd2b6999709 SHA-1: 87502218252f1d2d2d40e55d7d94ba7a8b005317 SHA-256: 961db7fe3778e7dbd67cdfce83f761ab29bfa7a3473e1562bc128fc5f4eb4395
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://philabc.ru/uplcv?utm_term=funeral+service+bible+verses+pdf PDF link annotation
    • https://mdteam.se/ckfinder/userfiles/files/pulikifuvomoxesujipiga.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/nanegituwetinete.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sobaxododapivuliviwuroda.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/vasaxisugukupoxexewizez.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/3852987841.pdfIn PDF document text
    • https://506hlapeta.com/files/file/26307389998.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/vadobiwulewidelufuvevi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f486f141ac---vazonoxanebonal.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/14924640979.pdfIn PDF document text
    • http://bmhs1964.com/clients/a/ae/ae3b7fe25fc1fd458a9bccd7578bee9c/File/lobifavuxejenetojibanele.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/88531510081.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/97d5ada5db1b15a08e6337a885859c21/69692646398.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/famezesofi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076319a74297---17755879506.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f85d8a10274---wumenofadexup.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/93l5ps57gi8h0qouu7b8p7mdpt/80819151169.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/kk0bmgjcs7e7duqit9e0vqla9i/66358593799.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/af486237cc5e2b3ac8ca30f8d4c38110/25735409404.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/44647273627.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/rexanujeruxedozazawaza.pdfIn PDF document text
    • http://osayit.com/images/file/jatexipedi.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/3803390543.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/74529471464.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a9102dbb8aa---94752580666.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/48436751969.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8279312b---togoritese.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_off0000be4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 15856 bytes
SHA-256: 26f89b9c9b678d9fa3131e620f81a47df121345cc1e086bce3b9c3e2bfd35118
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA3 10676 bytes
SHA-256: 6a2f1018fed996151180e791bf2ddce8886f8ac23074bad980d88a480124fefe

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