Malicious PDF — malware analysis report

Static analysis result for SHA-256 32385b3ed12ef00e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 18:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78564a7caceea8180a0a9c9504ccf44a SHA-1: 7f465beb4ff7e153d69a544ff58f27f5a089a6ab SHA-256: 32385b3ed12ef00e0a4b37351a51c730f4d88163604e40ba9d691150757203a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation attempts, likely leading to further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ana-jsc.com/upload/files/26800950754.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc7d0767---gatinepedepapojewi.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e1e592aae2202af336ae926b78a3fa1e/49624994567.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/82707309518.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/732527d4685def71887b6434aafcfd32/xepumik.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9484876b---87641441874.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/7266469410.pdfIn PDF document text
    • http://gerocuki.hu/user/file/dopubavemubevudosenogatal.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/34960958905.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/84505577609.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905070815284004elduwevkl6wk.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f769f351af---41429130191.pdfIn PDF document text
    • http://anm-av.de/uploads/files/nogonadevopodavujonabu.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/44945451892.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/walevisabidusamewuf.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305eafb9f5b---kirilixafajagepewugesitep.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109090159078436.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/38219825072.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/lujogerevululofowak.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/2329241939.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xawaxoturowojalaw.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/dogebubu.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/16907334394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tokyo+ghoul+war+age+apk+downloadPDF 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://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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 17900 bytes
SHA-256: 5e689720fc27f5f87ac00ce2ecf8ca0d4a34011e7c8d4a133450aec60fd3e79b
font_01_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 10668 bytes
SHA-256: 30935395eff5ba2274bce8b6088a78f1ce3d5cdac4deb69b196347672d13a2b2
font_02_sfnt_off00011fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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