Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abc0ceacf51872a…

MALICIOUS

PDF

112.3 KB Created: 2021-09-06 05:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d8c3bed574d7aa14e3808756dfe7f669 SHA-1: 4a491a26c7e716a8b04ab6f7e12058226ba4c0f0 SHA-256: 8abc0ceacf51872a81019f8ef658a12161d1ae59c84cf1f0e87c8340256cd0c5
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure and a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rtq33rmi0p3i4dg46g74vel7id/81151283017.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ohsk43dgaca1q5fvuqf83qmf42/matilagiz.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/nexikirofixuvew.pdfIn PDF document text
    • http://builderall.info/userfiles/file/59117398694.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/olre07210fupok0sh2iqberd64/5842535810.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/sazulaxobogid.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/27982178478.pdfIn PDF document text
    • http://proxima-design.cz/files/file/11105217837.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/28237226959.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/97576755398.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wabejixaxenizomum.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/60221960415.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/tugutofigaxapixisi.pdfIn PDF document text
    • https://shidoremicrosys.com/media/powixabamurizuzuxitil.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607579301d44c---92915044991.pdfIn PDF document text
    • https://kawanmto.info/contents//files/sukuzixudi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/lumepezexax.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/f1ppgqgd6c3v1ou7i47jtv4avk/46076217933.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/xekijafez.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/75687736923.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/lisixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=global+software+spreadsheet+server+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001552b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1552B 17212 bytes
SHA-256: 850c69a9e3da24bbc9fc0893474eaa44c032055dbb5aa3cce8567eea28e430ce
font_01_sfnt_off00018218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18218 11104 bytes
SHA-256: 9b878e877151090a3816fd43b45d8fdad4281f97d80a85c5787153d1e1e2edf8
font_02_sfnt_off00019bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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