Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa34704515cd5db8…

MALICIOUS

PDF

73.9 KB Created: 2021-07-27 10:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8f78c245575c916b9138087cecd7f40 SHA-1: 6ec4834720f97e640f5fc5d6aec2e9c7af9af8b0 SHA-256: fa34704515cd5db837eda9f5164c525c4964da5af3c599bc08f104445af1782e
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://greenlivinggarden.com/htdocs/UserFiles/file/38412612318.pdf In PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/98287695472.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/pijemafoximuvipatemoremiz.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7069869b213afec36c703ec056707fff/97404078233.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/wagisokematusepobunomu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3d845a4576b93a589cb634c916985666/rafobififub.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/85722316450.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/pobipulozutivopa.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ed37fe5afa74fa3dc0ab5599af886ff5/siduvomupijemazax.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/famokemuroluguvazip.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160771e7383c58---62559021591.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210701_053717.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d911a799d44---ragalutaxo.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/wajunuz.pdfIn PDF document text
    • http://geose.ru/userfiles/file/televewuxuxat.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/suvimologagevake.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcaf73f67---18435478785.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15112e249---68395531281.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/lubasudomugazomexiponako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=davut+kaya+harflerin+harekeli+okunu%C5%9FuPDF 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_off0000bb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 17948 bytes
SHA-256: 3a375467a265f25cff7aab11991396e948bc884d10b401fbeddc20f3745725b0
font_02_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 10760 bytes
SHA-256: e2023dcaa7e1fb38316b63e7ce2f6a005ee647c539d7bb9335d34617fe9ab8e7

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