Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cf0659d807421f…

MALICIOUS

PDF

92.8 KB Created: 2021-09-17 19:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b97ad1f9cd993da886d22cbc4fb7251a SHA-1: c30cae8334c34bd882caf29801f4742765398c7f SHA-256: d3cf0659d807421f96f35af37e0dbb298fcfeda4aebd7b3d8db7a0795b58a2ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://derey.nl/app/webroot/files/userfiles/files/13970555010.pdf In PDF document text
    • https://okinawa4d.com/contents/files/22294180118.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mekaduginobo.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/29106427103.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wakemupijiwijevanut.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h3fgba00js6ne2918ehs8ko4nn/bejopumapatakasafita.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/mematagusuvazom.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/rutikigigidavirowi.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/nemafadowol.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8319d283---58801143865.pdfIn PDF document text
    • https://intersat.lv/files/file/87498633447.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/72326916745.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656ff0a439---gavasijadavukunekod.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/39321260393.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210901_081211.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109051425219280.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/28906450348.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/xejapitujixul.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/sazol.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a9744bca96b03f79cc9e811a96a51cfc/zujemunot.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9e1236b51c599caa1254b1e73e2e061b/vevavaraked.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e290c876b066a10f9d0968a64f540faf/11523250981.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/tipodurajilipaxuj.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/90713406655.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/telizugijojejubenajerazal.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/60051401757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nikon+software+for+androidPDF 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_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 16924 bytes
SHA-256: 210157fe50ee2aef3cbca4a88cd14b84ddb31aec9fd87234471079332104d46e
font_01_sfnt_off000134fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 10456 bytes
SHA-256: c777457767886a82446fc8e249c81d63cfdd2810481eaf6251f14a23a395b81b
font_02_sfnt_off00014cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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