Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4c50d3c1032cd9…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 21:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e081e68c6d65b4581c60bda5ce186ccd SHA-1: 79d35f5f2d91f071c382f958d3b0062da26a4c5c SHA-256: 2e4c50d3c1032cd90595b961918f4e2afc118bd8fe69a6f5a0e4734180a00fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. Although no scripts were extracted, the structure and embedded URLs suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://razredna-nastava.net/files/9197261228.pdf In PDF document text
    • http://metabolizmusonline.hu/images/upload/file/vevodi.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gevebapokugotuwoposez.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/xizadijibewolovab.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/90956125275.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfea9af07---9090765265.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/xizojaxatafakupoxego.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/tolirofisozupel.pdfIn PDF document text
    • http://techmechengineers.com/uploads/vegulutulemozidemovo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2e5e1882---wezixasowitawijenum.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/81549934570.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/voxirumuzoxaganegedijig.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/mawilenedoduputonaxivud.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/19692010687.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/zonuworubetapetuk.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/87204314217.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/diluleloxutu.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/wisakajakazezu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/jaguwevolotuvitedozis.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/nolakiboreto.pdfIn PDF document text
    • http://vaynhe.com/upload/files/direjivekazomu.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/32845781042.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457a69944d2---vinimizag.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fjt421te504i0gb2mgfvurc6s4/lipakideruxutasotugasez.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/43207509983.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/39877742041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+rpg+on+android+2021PDF 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_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 10868 bytes
SHA-256: 1d7fff9a62879e2e755852f4fc9abfb5f0a827e8a8ac16c83de22da3c30f65fc
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 17340 bytes
SHA-256: bb10df6f3f5a0e4b095cf1a04042387d212068f2991ee7c370b08e007abb4cba

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