Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bc6f60eaa67e36…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 12:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c54af3afbfda9cd2fba76ee0d85f297 SHA-1: 3fd693bb342f86a507235c09a76f503dfaa9d3a3 SHA-256: 37bc6f60eaa67e36d1327986f21609d7403aeac7040e6eb42017ced5b252d8f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the 'link farm' heuristic point towards an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=hoover+carpet+cleaner+manual+fh50141 PDF link annotation
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/sevun.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/nonikujozetiw.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/78722367233.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3963a00914---zipevotisig.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3cac8646---vevedawokevosetu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c3c1e046a456f4ba31527f5f795f26e1/xajimetisute.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/90542097867.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/41804397813.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/db56549d50ac3a8ebc057c2b06820a32/tupokaboxe.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/sawogifiburumiravir.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30bff1fba2---24597210707.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d5682dc608ed3c95f37a2df6e975a5a8/49646424908.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/jurowegevamutuxizo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/1cbo5frg7o9rpvc7ui3evthg06/95599140499.pdfIn PDF document text
    • http://didopack.com/files/88887175796.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/33172495974.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/jupasukawenew.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161110cc40081b---pisojagif.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/76718756486.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/17566633819.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9d0c7a5d---vuxibux.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/filijowusemovu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/933a5681f0bea2165f7fdb2c6f075c79/43806084469.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/cea03e8f7e3edd0af18fcecdab6699d5/24744725483.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/vagubiwesorufawetulozidan.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/mojesomera.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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 17952 bytes
SHA-256: b14e62b51a3f629982a763ae34d4c68dbec5b40aca722268fc63b03ec04a670b
font_01_sfnt_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 11028 bytes
SHA-256: 8abaa4a425c4e9afc25c68509149b41261c05bdf461940ae3111e1c0cdd660bf

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