Malicious PDF — malware analysis report

Static analysis result for SHA-256 953ed4d86ec04081…

MALICIOUS

PDF

95.7 KB Created: 2021-08-01 09:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d371a48e6d932daafd16b9f8bf169c4 SHA-1: 96ed7f11131eded1a19df9adaa32d0257d5ce2f5 SHA-256: 953ed4d86ec04081dfff044d0ca52ded562982a68685e8226d115720c2d61288
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • 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 http://supair-lux.hu/ckfinder/userfiles/files/52726841550.pdf In PDF document text
    • https://aksusu.com/upload/files/jesobuxofimudaluvonada.pdfIn PDF document text
    • http://pattonbrayboy.com/clients/8/84/8444fd18e659e4cf0f5d78ff5dcadce3/File/83409964319.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5cbe68c35---73009189275.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/gadimori.pdfIn PDF document text
    • http://placc.info/up_image/63525959381.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095b50667342---rudalemetevozafe.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/61229844393.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/rogozasifipofukulifos.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/wanodoxufu.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/reloli.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/97074029884.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/46873879341.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/fc6171a88f1e5d27105e7898134e1606/62833090029.pdfIn PDF document text
    • https://luminex.pl/upload/file/kujobejasoresulurifoliwup.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606effccd8120---wazegixoxegogekizetedexa.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/vevajopapisa.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1623950221.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/kobejenativuwekevibumud.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609ade5539b12---zagefinozof.pdfIn PDF document text
    • http://computerdoki.hu/user/file/12707319807.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4a4a8823d195dfa9bda0e4e62a39e89c/35678942628.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0902128c7da82da8ec57728244df7241/budevo.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/zituxetopitizowifeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fancy+restaurants+near+me+dine+inPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 10556 bytes
SHA-256: 77be63230faf354f4a2d431eb34ae0ad1a6d18a2543d84c161b4e83d6ed51971
font_02_sfnt_off00012933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12933 17652 bytes
SHA-256: 51714ff06e1f28a507f088498e5f1ff75863a3f440dffba4e7475e78a52fad9c
font_03_sfnt_off000143e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E5 17276 bytes
SHA-256: 62b2cbefb4200823264fea508419bc8d09c4005a1dcf604d1102a4261604c67e

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