Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f955d6be0e1be7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 18:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78101473adc4da8e082dd5b273f56e81 SHA-1: 825281f83df7953c671a00c5131506290431c540 SHA-256: f1f955d6be0e1be7f2d863e73418c82e81b79afd2c79ad2f1a50ed60b93724a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the true destination or leverage trusted domains for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://munis-roquesalbes.cat/demo/vilalba/imatges/file/waperokewige.pdf In PDF document text
    • http://crescentcarpets.com/userfiles/file/3438328194.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/tofulifemusita.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/28063809569.pdfIn PDF document text
    • https://maturana.cl/upload/file/4168938677.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/jonetasavuj.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5db3a5062db997872bafd2046f9f971b/52950901361.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/92912077032.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/85950118674.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/40474548143.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/gixesow.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/15850554256.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wefab.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145df2e7ab55---jimalozugobuxibes.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/memanivi.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/28198703506.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161322e808c987---jadiwizadusapufurenane.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210915234540.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/rogeteposuzoza.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/xaxokimarukagowi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1c5894b0---bipajumadujaze.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3d0bc333---71390399874.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/xuvap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=integration+product+rule+examplePDF 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_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 10844 bytes
SHA-256: b8ef9b86be268a51a3262fc97615c633896c6c86187a8728ff3b2e6a70f5336d
font_01_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 17820 bytes
SHA-256: b29c4afef193ed6fc8eb932198f24910cf3411bac259e32b15e8f92f0617d8c1

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