Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad53adcfe31af03d…

MALICIOUS

PDF

93.2 KB Created: 2021-08-15 18:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f82926ceceaa7fe729c2a4729abb5b24 SHA-1: 7a82bb9aec1c585e256a515de2b694e4aa6352f3 SHA-256: ad53adcfe31af03dfd6f817d1f2804fd053864576bf63db93451caa6f1358780
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or link-farming scheme. The presence of embedded URLs and the nature of the heuristic firings point towards an attempt to redirect users to malicious sites, likely for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://oniceh.ru/uplcv?utm_term=sharp+breast+pain+early+pregnancy+sign PDF link annotation
    • http://suvagcentr.ru/userfiles/files/75715592880.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/jovoko.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6b3a09db4d41cc3e84a8cc396d8dc358/64103439741.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/3441057904.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609626cf9759b---wafukikuje.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a126db8eb092168fc60cf8538b1213d9/83453955062.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/sorefivapipiwejibajafew.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/63563491008.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/ripefek.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/86284087918.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ksit7vu4pcidmsgdqbphtiijn4/76134499884.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/nenojedepedodume.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/pepalejupaxogak.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/beripofaril.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/24392829016.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/rijipawudamifus.pdfIn PDF document text
    • http://tipiland.net/upload/file/galajolapawere.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/nofugevedimore.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jb35akgkc7t4hr08p27aff5uef/83441410856.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/wijepi.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vujowuxo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16116c642a3a0b---tizobobakodiso.pdfIn PDF document text
    • https://nada70.org/userfiles/file/3500551376.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/roxadalojizovojosowemil.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd64851125---futulavuwotulew.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b544652207e---kopofubanafawu.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/dugawuko.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_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 16816 bytes
SHA-256: 32aa88bb0cc180e4e9039628bc435aef5ac30e0cfa4789545193038ccd985006
font_01_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 10860 bytes
SHA-256: 9c1af4ef061d5cfa6c5af56f5bc94dd3cc3fb74fe1208e15ceac1d7eb521ed9d
font_02_sfnt_off00014dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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