Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b082cc67f53cd4…

MALICIOUS

PDF

79.9 KB Created: 2021-06-20 11:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e619d905871ebce75e2d5f0eed1351c7 SHA-1: e06bc0fc2b879d733bd5f15afd051821305034de SHA-256: 38b082cc67f53cd446d5a7975028ca4f9101ff20a83873aa19dbab9c2baa6958
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007. The primary attack pattern observed is the use of a malicious document as an attachment to lure victims to external sites.

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 http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16086741a02135---puwozoxep.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tlohpah7air7h732s1oqujmcod/tadonawore.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ba5d3909---42200600503.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/dotepakanuv.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/49618210798.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f759dbf6366e4711861623dde00aa6be/wimawizagesugazisuxira.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/21f1ad5bca9ffcae72f8622fd54f62de/50664162640.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/svm8c5g872kk1a47jfnlai6j46/7378864326.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/hpt6kpk8tg33of9hntmn85diq7/71421495815.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7af2f13233c73f09c9dd739e8b9f5fde/nitewamexoxelu.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/53962780969.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3c7438548710421cc149f4b056b85ddc/61394210625.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xonenesanawexaluja.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095d944dba64---192243932.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
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=om+namah+shivaya+song+bob+marleyPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 5428 bytes
SHA-256: eeae7efdadfa94d2910c1d1d66a1fc62618c951e4071dc12d3f5d4fa85a5cb36
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 11432 bytes
SHA-256: f670ca5299dc4cb88fe82168784d2b2ad96230e980bfd85462bd5053d1756591
font_02_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 6872 bytes
SHA-256: c14e111022d5b5d98042f03288dc5e34ebcd0a4210eeace387a5e5fa28c26bd9