Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf25d5d6458e4e5…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 23:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eaadb858389a451a25ce649956bbc84 SHA-1: 959a7e341ae8bf0f27ce67f913a8d20f3f98c874 SHA-256: 9bf25d5d6458e4e59bed95dc15764153c49d652fb7b12db063feb084295376bb
116 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content or for SEO spam. No scripts were extracted, but the PRC/3D content and link farm nature are suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://marblobathware.ph/app/webroot/img/files/86185255507.pdf In PDF document text
    • https://mikludava.lt/images/files/wagizusikaruzejosuletaraj.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/kupirirubokuxaval.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/fefozutesifox.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce29aa6d2---45062147520.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/gapubiwisirapof.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/7799002991.pdfIn PDF document text
    • http://kaies.net/upfiles/file/5726947422.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/wepeviforezagirul.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/puxevumusixiwapitajefi.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/bixawolabiwikogalejix.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26e8e8354---xezisanokedupu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b0713d7a59cbd0b6e833af154e8d60c2/67571940428.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nipetimiko.pdfIn PDF document text
    • http://gabortech.com/admin/file/pulas.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615847d1eb522---figugarufufoxagi.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/33131882330.pdfIn PDF document text
    • http://landia-print.com/pdir/file/doxudezodalofukarusal.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/jozekidajobimimur.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/rinaxosemibijixixij.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zidudolikasipotilo.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/goxorogezajovagu.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/dijaluwanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=no+anaerobes+isolated+meaningPDF 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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 10708 bytes
SHA-256: 3a099381612f1a9762530cdc83f509b527dca2f8e04fc43cb0cdd480ba3d90be
font_02_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 16548 bytes
SHA-256: a7cd5a2120cd4738707edb07de9294d37327c521d89c8267559f7b4393385ca1

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