Malicious PDF — malware analysis report

Static analysis result for SHA-256 0988de18f013ec1b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 22:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c4f05c06224830d941afbd122f993ac SHA-1: 41aa7dc4a6af93750d47fcb93e7893c87ccbf65d SHA-256: 0988de18f013ec1b37f3a9735d977721dca3752837f17234d82a998ba7ec48d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=surfboard+sb6121+manual PDF link annotation
    • http://www.physedu.in/newsite/userfiles/files/vapopokitalo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a574f16db01---74868789179.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/72384624667.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/87199010861.pdfIn PDF document text
    • http://starlightcelebre.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/64929446323.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/9030892934.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/97905158977.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a87603a9077---20197930486.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3bdd80ee99c295604e8830e4a8ef4781/davadedisevalawilerimoku.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4ottsn6dtmc618cjd3a9ua7vgr/matamuroruruxuxad.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3208e236---51881030670.pdfIn PDF document text
    • https://fratellifurloni.it/file/18682048462.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/rivovirutibaxivof.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/44855773624.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a2b012c0408f7756862c8469cee4e47a/60305125356.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/xozuzatesufiferonidora.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/tutamimejupuzeludoj.pdfIn PDF document text
    • http://eternoohydro.com/d/files/70111820843.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/85103fe9fc5fc5285f09561a9ae2ed69/34846354998.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/luralajisemileza.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842fdf28e0---pibumasel.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/57999137457.pdfIn PDF document text
    • http://reclamesticker.nl/images/uploads/file/pidinelasigepitaroxoso.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/rixogebizemekosutenoz.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/81537541263.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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 10848 bytes
SHA-256: 309b5f159526598cea497846dd4a3225aa24c3886f14e9efae7a6b3b0fb32b23
font_01_sfnt_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 18216 bytes
SHA-256: 3f1d136154eb5f4ab910f6dce294e71a4f95a94bad12b0d6c563ff3d0a75a1fa
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1