Malicious PDF — malware analysis report

Static analysis result for SHA-256 7558fe197cc93c37…

MALICIOUS

PDF

77.5 KB Created: 2021-09-02 14:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2b24e6b0ea5ecef9bacff2746722844 SHA-1: cddbfad6e7cf1f40fb6550d2c1e018470060dce0 SHA-256: 7558fe197cc93c37b72d9122ba137e8ee8d898ac9203d3fafdcbf2304828982c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware distribution attempt, potentially leveraging a browser exploit or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612173b28247c---53050308844.pdf In PDF document text
    • http://studiocariola.com/userfiles/files/82500697449.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/29071899412.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/xegoxifepeza.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/nebimemeja.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/87645794078.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/liwibuwovonevumatewug.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2d09e9a5---11053172081.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1b4c60e6956d7169bee0d6f673bbf48e/30638702238.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/werosaxobigatabiso.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/mesujevajenaviredexakam.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9427600527---linalagodisovodedotewawob.pdfIn PDF document text
    • https://gilbertems.com/videos/file/76341280716.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43e073ced---76113616480.pdfIn PDF document text
    • http://4bx.pl/public/file/rekuwofobaw.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/wikepoberatupi.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/jusitod.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c91553ae76---pekuzoxejanurade.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7890bafc2330d71b85621668723f3d26/xakawekusux.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6a02a741---zadawumexewevulokazovoju.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c410fc58e53823f9f6f9f5700f97129a/3266077952.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/80928982074.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/9514616843.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ce494d3922a---17057745651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=unir+pdf+applePDF 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_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 10112 bytes
SHA-256: 1eb051d0501b97a1e9cd5778c76596a4ef26611c03ae5db9ce32b15e86cbf718
font_01_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 18132 bytes
SHA-256: cae825792b27909787fc9c7b1f8325d8ed3bbf069d2cdda3de5a414bb80b83ce

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