Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9399e1430719b2e…

MALICIOUS

PDF

79.0 KB Created: 2021-08-29 06:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 473553fffc92acce0a5c61de97b38e79 SHA-1: 244558243ddab13cf82092c65241a1ab58f31ee4 SHA-256: e9399e1430719b2e36467c7b9a5fe93f60d092756780af4c9f0c7e450dc5cf16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution lure, consistent with spearphishing attachments.

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 http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7309dd7e53---zagawubupimo.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608671652c2ed---13687951293.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739cfca1e8e---692827992.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/jonabatekoji.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/34180606419.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7243dda83b17f282a89f9675371364b8/deriguxojopebuze.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/24919334205.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210818035642.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/23908723491.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/tugivalagetaluv.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/39406047078.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/gevigitidutometewel.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/xonokumakevinuxabopaguxu.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/wuselulevepixezudepe.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/64234661370.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7f696e0c6c6d3a7d5fd3201188054ec7/wiroxejafunifik.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qvs3q080c0r50g5rg8mt6gbvja/62169096630.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/3c1cf59c6ef377d75db2fe11d6acc8e0/furojiditedi.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/57121302835.pdfIn PDF document text
    • http://championsview.net/userimages/86738674584.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128524cd2f91---bamogupuvevufofipe.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/v88j4eub0cpi0n8vio09cbuh16/39730045471.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/ledotozojuxagurakafila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bank+exam+papers+pdf+downloadPDF 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_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 10800 bytes
SHA-256: 3d902d4a83513463aac6cc203cfefcc8a50743e5055c6056fb06cdb5e87547e9
font_02_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 17180 bytes
SHA-256: ff713e117f7e22bdea10e71fb06d8414c24dc52133ecd117513563bf67eb1833

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