Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90c67f731480a69…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 13:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6532aa31abe0e43de517085eccd40e13 SHA-1: 9044b17bf57c36f1fb5d478c06a90913d4e7d6f5 SHA-256: d90c67f731480a693da69d40530c0a50334f98a25596e3321785e78086c74557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The document body is unreadable binary data, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://solar-makernavi.com/ckfinder/userfiles/files/bemoraxifejugolapiwu.pdf In PDF document text
    • http://balcimimarlik.com/resimler/files/78679866250.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/lamisurufevatim.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/morefidajuvozawu.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/jutegedagifakofar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f70751df3---zefenarewuriposun.pdfIn PDF document text
    • http://jucal.es/images/file/10118085726.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/42551562961.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/vorirawezesareb.pdfIn PDF document text
    • https://koratspring.com/upload/file/vitowuv.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/23705660640.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161520e5216bbf---77034799921.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/zuxemuluzaninisonazig.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/98400508536.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d0c6f3a6e---posafamabidufatadu.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/78395926240.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/givekivonojukop.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ink2i747amvg63ogtp2uugvlfk/titapuxotuvaras.pdfIn PDF document text
    • http://cobmedia.hu/include/kediposi.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/ximidegimagawepavi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4567c1cd---18151649199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=employee+performance+management+system+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/2699595266.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 16144 bytes
SHA-256: 34247efb77ac2a6a503aa3bd20b60ea4a6d41a8a386fb1c7c5580634c5599d04
font_01_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 10968 bytes
SHA-256: a1077ee2bb2c58dc69201ebfbe9d7e33073da336433e7c229a9de747d49348bf

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