Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5123527d60b63d8…

MALICIOUS

PDF

91.3 KB Created: 2021-06-15 21:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8245d912264e55d6bb97bcb5926a698a SHA-1: 07e8801ace64233fa4d298025ca57dc368ab50df SHA-256: e5123527d60b63d81c9c3de1b2bf3604ca551065ded263461475fbe9b9a138d9
156 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 0.9996

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=thukra+ke+mera+pyar+video+song PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fdpbndgink2rheb3dljokbca8m/walarogiva.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f439d78af567321d6d1f1d3d119af392/79014300001.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2ebc5776---dulapij.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7f46090c---kobadinowo.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/145aad5766489fff83eac97b59f75b54/88695698102.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/40499300760.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26491a07---56837525470.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/r9gqeeasbrd6iiavdt7hnefrjr/vewemebimi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7afbd152---juzedodotazixixu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/47a078b1e5722e38878c0ac7b37be6a3/30974876886.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160940c49111ad---72543520584.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/butanopagomiziduke.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d75d9a660f---30125950200.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/wimaludizebikawamemo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d7675b3538f0ccb458c58b5c97d71365/26405403578.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/denizujavakedixudozuposuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://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_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 5516 bytes
SHA-256: 46908dd9cdb665b4e1bb0ecb0c53f06056f237f2d7230dc804297313f3b29532
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 11052 bytes
SHA-256: dc7029330ef5ed5a434934f6ef167a4db0ca3d6ddc268819802fcb576820f18b
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 16248 bytes
SHA-256: 866015cd4155c38f4f6868c96f995ecd59a96a0677f4db76e7b296cad08ba6d5
font_03_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 8576 bytes
SHA-256: a4ac04398d33efc108f972fdb1cc9e73f16daa85f73f45a6d764ade0924cbada