Malicious PDF — malware analysis report

Static analysis result for SHA-256 26764dc961957de0…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 15:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba9d183002f05a7009d81c8bdf3fd2e2 SHA-1: 9a81da2688f8d73a8199101c41fd92878e3a8d96 SHA-256: 26764dc961957de0652c920fcd040d81db7de9283be92da900684813dab0e448
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=skam+italia+season+2+english+subtitles PDF link annotation
    • http://fatimaartwork.com/userfiles/file/kumunufekufuxonewegaxaxi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/81762962511.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/85098883547.pdfIn PDF document text
    • https://solturism.ro/images/file/xamakutapajivixeramug.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614679cd1bcd7---xovovamawabosazilalibane.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mpm2eer42ofavfh3ig7ootmon5/38349141603.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/nisorawot.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918192408773902redol.pdfIn PDF document text
    • https://kapefashion.com/files/files/nopil.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/1354296820.pdfIn PDF document text
    • https://t2sc.me/userfiles/13631632584.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/86356590882.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/93790798707.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/nitot.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/dovegoxejabegipanu.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/64143642391.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/bunipewuxovimevufanuzi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02072ab18---53119793890.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/41841304600.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/kevivalawopijadapa.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/39952448903.pdfIn PDF document text
    • https://raljob.com/userfiles/file/93475503037.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/jejowidusixepeweneneb.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_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 18868 bytes
SHA-256: 7793cfd10f5adf88cb488dac2239276a6628f25e849a468ceaeb5a9e34ab94b7
font_01_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 10984 bytes
SHA-256: 5fca4eed4f9e0bbf8c3e6faa5e7b2cc5cc35ccc6c354348d7ad48d5c76be3917
font_02_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1