Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43b632c6dd9d4df…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 18:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06745d8ae69aac06678c18ca78d228d3 SHA-1: 4fe9481ee081423ffec6a7852397047b68a972db SHA-256: b43b632c6dd9d4df24d6cb78fde1b2ed36ef46ebaedcca5eb59f733c56d290ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=what+channel+is+tonight%27s+fight+on PDF link annotation
    • http://aquamedia.cn/ckfinder/userfiles/files/78166536107.pdfIn PDF document text
    • https://granitnet.hu/editor_up/ropexawinotebixa.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/dabetegarowelanemegofose.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/66110981222.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/vurukapo.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0i03g1nkcf1t2t6hulep2rrn4u/25760501967.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/pakibefixekowelofefuwaf.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/fomisiduwixisivesalimox.pdfIn PDF document text
    • http://brukbet.com/user_images/file/doxodiwawipakaxo.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/xegefigoxidi.pdfIn PDF document text
    • https://12shio3.com/contents/files/pisanezusewexap.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16132f4a39ac08---94798905328.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/kimivopa.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/kenexojakirudu.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/56264091427.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/526fl00hia2n3fd9c2qd01aps5/mefezujufubodoraselek.pdfIn PDF document text
    • http://risme.vn/files/ridubibikopijazozebej.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000c1c6f7a---rolusafelemigoras.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e77a87e9---57878809881.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/menokawirutufi.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b2ae109a31a8eda0e72261b38eabeff4/fozakoxilukusowakoxexu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4da7baa30a17d8785b6dd26ad43eb366/57304683380.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/gudusakominup.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/kexukogamosupanomexop.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/58211207566.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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 17820 bytes
SHA-256: dc133663b44cb235b5efd77e1aea3a604ce02b37eb9c16f78667fc50ce502181
font_01_sfnt_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 10544 bytes
SHA-256: b6eb198f7f42a0c680da65df34fa140c06f7ed5e5f32608fa59ccf64e2e7f45b

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