Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e488f2ff34588a1…

MALICIOUS

PDF

63.8 KB Created: 2021-05-10 03:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6c89a0942ddf838dce75ae46fadd7b0 SHA-1: 142e96db3a84d5d03822092ccff60fc05f3090ce SHA-256: 9e488f2ff34588a1ad7bfac0683dd1a08ae5251c56899b17e84cdb2194486022
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8599

Heuristics 5

  • 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
  • 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 http://portalcom-b2b.es/img/user///file/_0143085001619900386.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb29f258a1---67086693501.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608641fa8a6ea---28463981006.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/obua0367dnke94f731oi329e7f/rexuvapodobazebigesixod.pdf
    • http://adamlegal.com/userfiles/file/mukisabaxinasex.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16fd683f8---nubalomifegozegalun.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cbh0mr1edp0qt0qlsl66pfd1d4/laxagopiguzesaxup.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7aaf2fa10---xonojutuduzosubadonupo.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa90f7a787---jowosejirejiwija.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16205921967166.pdf
    • https://auto-rujo.com/images-editor/file/15469924247.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s8qvdc3blp7l2c404v9aouhror/ganatogewuwa.pdf
    • https://amitadevnani.com/userfiles/file/fujapalavagufelil.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16075a346bdd25---8402788854.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609859d8df4bf---wepewimovegameziloxewet.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5mts4aqr0n9173n5crpv7dbnf6/15252584943.pdf
    • http://analogsys.com/uploaded/file/1332423829608bc2f368fc5.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b205db206---91419983645.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=helicobacter+pylori+resistente+tratamiento+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83d.bin
8021900b7b8518afa7f18826d9e53b724503d1a18c22dd8164418432062e8887		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 5292 bytes

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