Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad50e8f361e7b59…

MALICIOUS

PDF

88.1 KB Created: 2021-10-16 00:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98bf9dcf187ed2d1f78815d90f0a0062 SHA-1: 681f3a4477540215d9efc87a31189170876e166d SHA-256: 9ad50e8f361e7b593152f05d934e025f650cc07dc88e26dceb4c55f61454665e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4492

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://laborke.ru/uplcv?utm_term=concealed+firearm+permit PDF link annotation
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/vebot.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/54969189099.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1632005782.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/46283266423.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/54328114362.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/karibepesu.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/49379295557.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/gujal.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a749a042c5---kaxafubalomigunafekazopox.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/79298174445.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/fakasorenev.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/wuwasukiso.pdfIn PDF document text
    • http://vecsecity.info/editor_up/54521700096.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/zagabozidawiraz.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/97693411439.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/73226290549.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161645a0ff14c3---vikafafemub.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/bedal.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/55909294739.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16156bd7f45c3f---wonumovegavupinajabataj.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/nasazenedunolujara.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/pakuzibapifazev.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/99810720015.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h2rbf5ip1n42g9kqlcj4rk80m1/24300791617.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/tagujizu.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_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 17876 bytes
SHA-256: a3f72f4cde4cadf74e0ddb6c6e5f5f0763559b23f4547b7a89f49c45ab6c834d
font_02_sfnt_off000149f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F7 10644 bytes
SHA-256: d69476f88b3c89202fe6746f6de070f08a7a38bc3057adcacbd0e6833c9514a6