Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e40fdd6fdc15a8…

MALICIOUS

PDF

328.7 KB Created: 2021-06-23 16:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cd5640b658008898f17fb270a4a28e97 SHA-1: 0de7979ab73da063bf16755b2517ca211da191bb SHA-256: d8e40fdd6fdc15a8a7bc31f85bc180d37d279e6b006b50e28bbacad0c43c366e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9738

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.
  • 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://rilta.net/userfiles/files/tudid.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2489b9d7c1ed9a65b07bed5371ba3c08/wowilejotekifizugaz.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/92894981451.pdfIn PDF document text
    • http://envigest.cz/upload/file/tifem.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/xazudiluf.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/vugawunizu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95fc71a4d---69357232913.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdaad0d6c---48620963771.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/bizepaza.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d7f9189fa3---dodofukodov.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/06a4bd48cbf1d9b35836080380da20d0/74260904286.pdfIn PDF document text
    • http://amdind.com/userfiles/file/62613038089.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kdn3luu0lf5avg13cfkll5us96/debasaroxexila.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/216271338c08d3908ea002a991cdc883/posafunukavoxowogerome.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/15148835470.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/748rrbht21sums54r8h422cu71/51032329898.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/foxosemevijolaxuxef.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8fbde8966---tuweruzi.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=find+assignment+answersPDF 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://scripts.sil.org/OFLIn 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_off0004b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B55F 1872 bytes
SHA-256: b1b733d6dcd41c651d24b99c9f5200ade4dd71601f7ee8dbd3095764b9703bfb
font_01_sfnt_off0004be54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE54 5160 bytes
SHA-256: 65f328d3b87cc90dbceabf672a86f18c173228d765c0d355c8b6a4e911e4589a
font_02_sfnt_off0004cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CFDC 13612 bytes
SHA-256: 92f22d38cd73c2e84341037754054b8d72ff619f9b85c5a5240fa720f5a79efc
font_03_sfnt_off0004fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE0A 16244 bytes
SHA-256: d37b3368a3d7f50fff0cf5d5a4487467b32a45fa55504af53886a69cca9d31d2