Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ca79385d155745…

MALICIOUS

PDF

68.6 KB Created: 2021-09-21 06:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6adff9e3a904e1802556767b286bad2 SHA-1: 23b44f21f23fbee3179082cd975ca68d9ba026d2 SHA-256: 00ca79385d1557457e44be402b78ec707151a57438e73760c8552111e0b52dcb
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7319

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://wastran.ru/uplcv?utm_term=roms+psp+games PDF link annotation
    • http://eatatrudy.com/uploads/files/velerizulefuvujukadux.pdfIn PDF document text
    • http://potlista.com/file/files/11628275098.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/73705288024.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vazafufubisonasujiroveg.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/birununiputudu.pdfIn PDF document text
    • http://labradory.pl/file/paxugozozeno.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/11416305758.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/85535973512.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fipotijilopetojom.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/53464725820.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/bokewez.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/zinoj.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f86d2c14cb3e148cc51002233e58b73e/xasodorufarogugotojakid.pdfIn PDF document text
    • http://superazs.ru/images/news/file/zajuxidenuluzafoxog.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/27246120372.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132f569316ff---gunabe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133dc78cbe93---16451698304.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/negogonotafevitagujow.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/virafabikavasinomenamile.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210904044523.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/xefifi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5e3bb4612953c799107d76aa31612ebd/38905222167.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/zosomi.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/43244503226.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/20141544769.pdfIn 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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 16004 bytes
SHA-256: 50f7ef55692e292fe555b423ebdc876a245ce9500435c2a73b2f41f467f28d37
font_02_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 10200 bytes
SHA-256: 4e70d4cfd41d2cab9a370f2d5ae2daa114f4e3e29d06ccda3f89ba86f74f5802