Malicious PDF — malware analysis report

Static analysis result for SHA-256 6510f467db8f87c0…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 23:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d3cb3e683e9e695b708fa5ecc9391018 SHA-1: d1462a3d13c562d925f82822b7beb037ab70c54a SHA-256: 6510f467db8f87c0aa3b4f44247d9038ff31ec8fc8eb756131d509cd4992d6b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple external URI heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coffeetuanvang.com/Images_upload/files/11505099015.pdf In PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904045058.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/62657915906.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/98790990547.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/92268371504.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/22675596100.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090312123728.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/12192798971.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/dedugufid.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/914410450a56de3a238ac389f82fcd94.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/27212292656.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xikorunagudofonox.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/47c53fb2e7de2d4ddf24dedfd6588e04/wonuje.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8eace467992505ed277a5478205cdb42/xevurabigek.pdfIn PDF document text
    • http://thongthien.vn/upload/files/gafepojaxivutagofixelafu.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/26720048076.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/megeloronowojib.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/jafisuwezapimevibez.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/46738952299.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199159184452.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/womimur.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/wokifidosafapeworof.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372a44a43f7---wewodomexugelixufifenom.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/makisuki.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/93655556782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=floyd+mayweather+fight+onlinePDF 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_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 18352 bytes
SHA-256: c3cba9acdc2387cb86023fbd9521bb0a41d9ec27d1b50f700386718f855664a8
font_01_sfnt_off00011d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 10812 bytes
SHA-256: e889bc3aef32f0ed5bf0853b56db14028eb6eebdc6dbebe139bdae6275ad0358
font_02_sfnt_off0001361c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1