Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c13bc771f46190…

MALICIOUS

PDF

86.1 KB Created: 2021-06-14 20:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cfaf7404cce0d85cbc32c58e0bd1a88c SHA-1: 632e2e8712b4c8dea80e0b891d3316fa5720b993 SHA-256: 09c13bc771f4619021362de20a2f448a29ea1b34931e2401b2fc8a265e784dfa
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a phishing and trojan threat. It functions as a link farm, directing users to download further malicious PDFs from compromised websites, disguised with lures like "Procurement dashboard excel template free download". The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=procurement+dashboard+excel+template+free+download PDF link annotation
    • https://oklogistic.lv/upload/file/4714021109.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m4t6alkl17ulla97iit3gqe9hv/75683665073.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0d12b7eee6fbb09e85edda6065060b89/69282837714.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7c56283ce---22991524595.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/32939992213.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7a030a9d206804152014ad98406be862/39418827688.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/30216508159.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/lifuripovugapofovim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c0973ec2---bipefimejadefevik.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/cop1f6vead844aeebg839afi94/8727706775.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/jazipitisowoduvixemulof.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d624d14f6d---2090002969.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/91a5bdae52c7f159d3c50387b3b5e689/64476267762.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0085da6990---dejizuwimudoxofap.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec1183d54---63546337720.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jhui849ambus46b0mqpr2dncgq/41607070734.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 5696 bytes
SHA-256: 8a60ad286940d0cb1836da54601f53f0fe48501241587a7b18cd7e7dafb321ba
font_01_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 10644 bytes
SHA-256: df86583f0a2097221c1b72a27b489339ffdd7f36d5b5d517746f72201863edbb