Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b54fe7f7996b5e…

MALICIOUS

PDF

67.3 KB Created: 2021-06-20 16:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1276913a718b36b6f71ac428f3fcee9d SHA-1: cc70c1979861b22d22540d02fcd82b6ce30008a6 SHA-256: 17b54fe7f7996b5e8c9b5656760b84daed85272a9f8c9d860c90678cda27bab6
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 0.9998

Heuristics 6

  • 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
  • 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://irlanc.ru/uplcv?utm_term=best+of+hillsong+worship+mix+mp3+download PDF link annotation
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4glot0tdb8vr9ivlfjegsdojg1/xarefelumapeke.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ougttncir94nc1bovrv5rc2hca/bewoxuzanapu.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/domujowexinogopivuposen.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a6c073ce---zirevotuj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7eb980bf38e5847020192332b4a52c85/jeruvosemixubapujekado.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5f4f3e841---89916496035.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/41774335731.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/veweni.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4db421b09---54602603844.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c63f79e7f1735d5a1a037ffd1295f903/13739970246.pdfIn PDF document text
    • http://fygl.net/uploads/file/10092800216.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cde377bd34e8969149d6b4954096d223/pomotukujigewupegebimi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c652106d288---7040874335.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c9be417ffd8e8fa3ae765ed7a4c1da9e/luwevumuzupabufawafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC73 5828 bytes
SHA-256: fa38cb9049e8f15005dc0a52c18c2d5163457ff57281a7a16591262ceeb0fe29
font_01_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 2140 bytes
SHA-256: 289854c0292170102eeea8cd8d9fa039b7e5adf06f71653ea533c14c4e2d2c34
font_02_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 10408 bytes
SHA-256: 5e19752104e5f65fb595123c7398d2fad573fafdc7f3d583d81d89622b2e1e0c