Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a9a1d00e842ad7…

MALICIOUS

PDF

64.0 KB Created: 2021-09-29 08:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56dc73f79ef809be43df22bd584c0067 SHA-1: cff4158311f35cdcadc9cf869d97f405b8121f1e SHA-256: f6a9a1d00e842ad7c6aa726ad2a1369c7fb7d16f45d162657b366854c67edf52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

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 https://nomylo.ru/uplcv?utm_term=sdk+platform+tools+download
    • http://suliaok.com/v15/Upload/file/202191638221753.pdf
    • https://footballsod.com/images/ck-uploads/files/91880304682.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/ribixozojikuwigezaxik.pdf
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/komax.pdf
    • https://literie-depot.fr/UserFiles/file/ninabewatiriv.pdf
    • https://garnet-medical.com/userfiles/files/visalojit.pdf
    • https://alohasafaris.com/files/gigukafumowogozo.pdf
    • https://bharatceramics.in/ckfinder/userfiles/files/99264601433.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f996524e08---delefamavezilosakad.pdf
    • http://eegbiofeedback-leszno.pl/userfiles/file/98416401320.pdf
    • http://madiagranitosilano.it/userfiles/files/gifojutokusaz.pdf
    • http://tt-ural.su/admin/ckfinder/userfiles/files/xosemitinolapudipexusukit.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf2eb9d2e---wujejunivakek.pdf
    • https://fallsplat.se/bildbank/file/webez.pdf
    • http://rnralpha.cz/res/file/bofesodaniwi.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1c665326cc9c94060e21f2883dc13c8c/15723046422.pdf
    • http://regmac.net/userfiles/files/45702820805.pdf
    • http://aranykoronakft.hu/userfiles/file/82512275784.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143661e0adc2---pasexa.pdf
    • https://parkettworld.com/upload/files/53340563749.pdf
    • https://vanchuyensahara.com/site/files/23892302625.pdf
    • http://net-marketing.hu/images/files/doradudexatonuxorasuri.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/fogaz.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/vojere.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b137316be---85563960241.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b16a.bin
16c3cbb48745c09fb18fbe5951fb9e936e4d71da010ebe32ac6d6e750cf3ecd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB16A 15904 bytes
font_01_sfnt_off0000da2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 16792 bytes