Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9bb4a4ade17a19…

MALICIOUS

PDF

142.8 KB Created: 2021-08-14 03:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00d330cc2aa57c174e4cdda186682828 SHA-1: 3e5a4529dffd2694decc28a1b2d7a25aaa235ca2 SHA-256: 8d9bb4a4ade17a19d2728572083ff64732d06149c4e76300cdd66b231afd50a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://drafthe.ru/uplcv?utm_term=guion+de+monologo+comico PDF link annotation
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092656b09589---34558690340.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/tawokaluralevasasataju.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc8acbcbc---80683261854.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nalcdf6tu70dtd3so4658tfjid/vejeba.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/20881039897.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fde173bd1d0---kudesuwusotiripakaz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609413ec7ee91---waxetibawepuxi.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nuvudifowesexokowekimolo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1f60d96464bd9f760453ff88c008df48/19726684839.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/q65taciort2at3ng5pr4d0e4d6/lujisixusekibi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/dikologopititoganewokufe.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210809220721.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35898a4e7---73171164011.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9f3e42dc6---59126269008.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/67992439864.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b623ddc90ec---taxeripukiv.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///6742572731.pdfIn PDF document text
    • https://invest.pl/userfiles/file/41853818187.pdfIn PDF document text
    • https://agermag.ro/mm/file/58279972558.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/34564173499.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1129212293---3439087397.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/72500784eac8f730d8ff21cee6123ac6/sabitamugeg.pdfIn PDF document text
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/21524985310.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_off0001cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBA3 10324 bytes
SHA-256: 21ee3514872f7b4d2bd6d8602585f9b789d23c295fe16b13a7beebaebab4e7c4
font_01_sfnt_off0001e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E29B 19780 bytes
SHA-256: ec2bece54703a6c689dfdc698b94cdaa9fcc0abc22699bcf9d162ab5d1fed27a
font_02_sfnt_off000214b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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