Malicious PDF — malware analysis report

Static analysis result for SHA-256 adba1d207e0ade4a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-30 22:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e16d8ae34a1343f0dfb75b455ee03102 SHA-1: a9a46ec02c4eb52a3f80e1e7bfeca8b25f638037 SHA-256: adba1d207e0ade4aac2a523b9f8cf5bd9b3202b4d23c5581cdae2769ee0e1bdf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host a collection of links, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=pc+games+apps+for+windows+7 PDF link annotation
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/56036516737.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139414c5d2dd---34010474095.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/ponovegetutefa.pdfIn PDF document text
    • http://arablift.net/userfiles/file/pajifitegurotejufokiwani.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xedotif.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e024bc1611---goturademasa.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/67290419132.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/fimago.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/89335239288.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/74839465949.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/sabara.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/53770283737.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/66805567139.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614e84a929c89---mojez.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///11398919938.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24cf07866---37447190968.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/buxivojixetululozo.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/faxipafopij.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zopar.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/zoxawufenonogodoj.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/dexipaweze.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/66097910225.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161501dad75f65---kisexonujusoxuxotigo.pdfIn PDF document text
    • http://learningkey.org/userfiles/furevolekekumavudeji.pdfIn PDF document text
    • 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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 10956 bytes
SHA-256: b4cd9def1d476ffe6029284cdfeb622004a56d7ae0d80d877adf5209eea75362
font_01_sfnt_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 21312 bytes
SHA-256: 29b24b9207acbdefedeab672368aaaf7c5191bb60639784f64dc6aaa5574d88a

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