Malicious PDF — malware analysis report

Static analysis result for SHA-256 faaff2c02948a0d0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 01:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19d1174097710ad6bc7e5f6e2c6b928a SHA-1: 736958ea13b6472519abb727ff9260ad062daf9e SHA-256: faaff2c02948a0d0c0ed78374f3cc2d1045198eaadb4da46d32316edbbaa48cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=gta+sa+download+for+android+500mb PDF link annotation
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132d13266d64---tumesimizaluxewaduriji.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/41363009728.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/tibekawivajiv.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109060919524400.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/5723403874.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/46461294983.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f2773eed7ae2ffc5bc1207b975be0507/43955933113.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914012241.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/85510719724.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eefe367e8a---25331709490.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/27602709327.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/xabagavarosizumeja.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/20415540473.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/35141048982.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/62955546535.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5ead557fd---pisuvirega.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/fuvozilegedutu.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/81795581269.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd86106b6---43409595738.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/62205303465.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/dowot.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/piwojebez.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/tomomiluwebudetaluzomitud.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_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 16916 bytes
SHA-256: 06973eacca4f137985d458983645f01188684b1fe773dfb51bcaefa89e8dd80c
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 10904 bytes
SHA-256: 7a12b16b0ce39c12517bb351cb482adccabe68622a4da578b8ad6310d74d91c9
font_02_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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