Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d3acb96528655c…

MALICIOUS

PDF

98.4 KB Created: 2021-08-26 06:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3ae7d9630f8bd9861c35ee3e1750621 SHA-1: 13488eb5f428f1ca1311aa63ec760b5f06cea328 SHA-256: 31d3acb96528655ccd0da5bd890320fdc4479d8849ec4e831b2d4315718c1261
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4302

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://proxima-design.cz/files/file/53217612298.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077805930332---jizonakatunolajoko.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a6445ee10---raderokogekagokagefumubo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086276f1e844---maranexemabogupidadakos.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/53948977996.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161141adc230b2---40637752532.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/runapokagamum.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/68888829823.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/49397003034.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/63176602394.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c931a0c8ce1---nimogovasodivi.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/roxumepiner.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7ccd43f92a2cbcd171cfe1febf86893/mivebefeguzoxogimimolagax.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/50679584005.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1610963c0ed9de---ruxawugafexolegonepojogid.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/97936142588.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/gidulefevelalutanokag.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/zuzoj.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c442c7d0e4e---98023197373.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751003a4098---93706423408.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c1f88ee81---fejejizaloz.pdfIn PDF document text
    • http://www.puhito.hu/uploads/vevubekagezavunadav.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8fb16b22---rifujalota.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/10e77ac874b5c8662b80164a606aa87b/94142719147.pdfIn PDF document text
    • https://realschoolspirit.com/scauserfiles/files/nowum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=martellia+maine+coon+catteryPDF link annotation
    • 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_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 10332 bytes
SHA-256: c3ed64240007bb5a26b4d5021a36b3dec4df595f54ba41fbf0987a717fedd530
font_01_sfnt_off000144eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EB 18208 bytes
SHA-256: b487419679a33a90fc11a6ce67971caf0fdde1c285d4b6dcc03e4380e4376d80
font_02_sfnt_off000173a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1