Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb7c6aea29c110b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 02:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f891ed0568360663c719eece32fc893 SHA-1: b6c8f1bb282ae906a80ffa9ae0e686325d6c7248 SHA-256: efb7c6aea29c110bdd957807f6b6681e263adfb60c3d8b4002491145b6903c64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://smidgel.ru/uplcv?utm_term=how+to+make+vpn+app+for+android PDF link annotation
    • http://ccshecea.org/upload/files/misisivonare.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/7470068716.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/kajezomemoxirup.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210905_E4CBB6E47284FD89.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/72962953150.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d0b163fed45643632ecb1b81fccca67/rirasu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8da0ac0bb---53188462369.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/kosukogigexumof.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/83446906489.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/42269421167.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/50059025956.pdfIn PDF document text
    • http://partnercable.hu/files/wozuvat.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/kidax.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/73406369714.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/41898533549.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5b15945131419a93ba89b3b8fc4a4996/xesovonexafilerofe.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zidusodedesaza.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/fixezenasotoneseg.pdfIn PDF document text
    • http://sgpeo.pl/users/file/65257667843.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/mojaxifojuw.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/36833559569.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/77381420207.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/gebidagomimivusarig.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/nagijubiful.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/79866817000.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dbfbe9bce790da49f0d0207bfc9aa1ee/duzaxovukowesimexon.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f1bee573---wogamixepinolarefilujoxo.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_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 10680 bytes
SHA-256: 0716a7c1d33c0ea8246db75d2527eca3e833d656acea5ae531ed2e046e225031
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 17340 bytes
SHA-256: 68b83de46077760c7661061d36a286f113e035d876c109509a8b88a538e56275
font_02_sfnt_off0001332f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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