Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64d7e637dd36e2b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 02:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db426c53e76194f0ede729d85a9865ca SHA-1: 5f0941119d214dffed195366c9d0acfa3821084e SHA-256: a64d7e637dd36e2b70d5e5ea5343d785f98e02863073ff22a14b7dabf06ee87e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress upload directories and other disposable hosting. These elements suggest the PDF is intended to exploit vulnerabilities or trick users into visiting malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=logan%27s+run+pdf PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614034d8e968c---48490479882.pdfIn PDF document text
    • http://sinoorchids.com/image/file/65853415688.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/2129244007.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/78320233492.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/rovipexijunafapaxomuzuwus.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/rijojexumuzabesumatoz.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/ramukipewumaxunen.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/roxafakonetijebuko.pdfIn PDF document text
    • http://gtshotel.it/images/file/malogidasonel.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/texapazuperorenevufuju.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614512b255442---21090472833.pdfIn PDF document text
    • https://projetovm.com/uploads/files/demikokosol.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3b08112da---37924374325.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8858937e---81330159806.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/14830805965.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/pebululomo.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/46315123944.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/14434750500.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nawaxupukosukogepuk.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/17978911718.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b78bb171ecfdfa4c04ff484a7550da9f/91096774304.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/motinidirukusuwenifuju.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/rijaximilixuwu.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/27675926129.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_off0000c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 10396 bytes
SHA-256: ced137a8e68883788736532ad841525922ae1d16eb8d0db4ec1d55afac4c65eb
font_01_sfnt_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 16616 bytes
SHA-256: 9f152c2d5a5fe89ce141658630184900f6b2520f6492275d3b813b9aa1b49314
font_02_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1