Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4f419918cbaf20…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 12:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbc1e7d16a1d576081b58f7440d8fc00 SHA-1: a1de8895d27aa2db4e31996bee7de210c176f849 SHA-256: 8a4f419918cbaf20fada2af35d1032a823a824577a73870fd2ebe295c9186f4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic strongly suggest an attempt to deliver a second-stage payload or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sunnyten.net/userData/board/file/11692746055.pdf In PDF document text
    • https://bursakaynak.net/userfiles/file/87090986482.pdfIn PDF document text
    • https://badrivishal.com/media/25158635898.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/supinemoxoriwiju.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/96701153523.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/48312712420.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/nedikesamaxekovarijugagid.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4a1266e8---48438022729.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/28225129508.pdfIn PDF document text
    • https://tebra.si/userfiles/file/96911779403.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/depalixad.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/73827069263.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/02a76b667c4b53493c24aa13d9919086/50887724607.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/penewap.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/dodivonimo.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/15682954539.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/pazifazozota.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/xasixenojunufesibado.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kufikivugitagimuref.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/65160838205.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/91122266482.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/75504278332.pdfIn PDF document text
    • http://erex.hu/upload/file/95978664720.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/tiseki.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4f906694f1ed4f5d0bc177ab3f8e5ce2/36261028386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=android+phone+randomly+plays+musicPDF 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_off0000bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB23 10876 bytes
SHA-256: a34e2e31aca74ccefd878a5f4cb6ae3a7fbdabce49d488c04b08f5513f18b440
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 16384 bytes
SHA-256: c017b286b25fb50472fb4f8e32ba9790e1970fb20920a387e759aabfca8ae3c5
font_02_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1