Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fbf9f86fc2f5bc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 16:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ec77d1128c0ca324fb2ee4382c22cee SHA-1: ce7670766070c68262e00bcf597a6c351d5d0031 SHA-256: e5fbf9f86fc2f5bc6837d6acbfe0468be5d6cf0bd652c9e321b6188121b8baeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that redirects to a link farm, which in turn hosts more PDF files. This behavior is indicative of a phishing or malware distribution campaign, leveraging compromised websites for hosting. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=3+letter+words+starting+with+i+for+kindergarten PDF link annotation
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909120124668153.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20471ac64d5a7c6dd946cd4a20e03204/88338647633.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/maworibelu.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/27797150388.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/fixirejegovilemolebiti.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/zapas.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210915192737.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/zevakajorusiveper.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af3eecf4a---saliwibolafurepavuped.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/82794660197.pdfIn PDF document text
    • https://cristalensi.com/public/File/tofesoduw.pdfIn PDF document text
    • http://parilka.by/var/upload/file/92256806581.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/42536297189.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380e50e8cc8---pijoxusipapomo.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/18538433435.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135950049dc4---beviloxisodagam.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/femupufedumaluletun.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/mowuvagifapabajutewitenu.pdfIn PDF document text
    • https://subarini.ro/mm/file/64772761309.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/wetazixigolaxejikupe.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/gisawetajejupujoreb.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/74807580176.pdfIn PDF document text
    • http://jawarakreasi.com/file/24698429788.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_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 17096 bytes
SHA-256: af4a0fe1748b2c758090d3994fe7dbff93b349cf1c0af181f25ec8f0750d5484
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10888 bytes
SHA-256: 2e7193b8a8bbe0302458b4f9c8fa1fca3fc09a3448492f3730d271ec6d18ee6f

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