Malicious PDF — malware analysis report

Static analysis result for SHA-256 25660dbf0291b6b0…

MALICIOUS

PDF

87.3 KB Created: 2021-09-04 02:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a205ef9a6b1c1f16130ebcb7fc1f1dd6 SHA-1: e94bdb1e61cd90367ebc89f33ece1569a58de6e1 SHA-256: 25660dbf0291b6b03649df375469b439b7daf93d43db2787bdc090eccceda519
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The document's structure as a link farm, combined with the compromised hosting, points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5851

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://queure.ru/uplcv?utm_term=bridges+in+mathematics+grade+5+home+connections+answer+key+pdf PDF link annotation
    • http://epmresearch.org/userfiles/files/falowexojikav.pdfIn PDF document text
    • https://angkalaris.com/contents//files/fuvipakalekaruvivekovuvo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/62716365128af343953176bdfb39052a/xotabilonok.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f31b5bbc8---garesanolopasiwaredofulop.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160996519ef680---tonajajixidifabupeborazux.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/41909307604.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mhodhi8ga56v5tbcbtqbp6qq53/kufikekujalo.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b01b21cb6ea---80852843704.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/felezava.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7b75b7a7338edfaecde5122cd1e1ceb0/21932877052.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/sofaxaxamodajuvupaw.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/44609512715.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/gukumipe.pdfIn PDF document text
    • https://latework.cz/soubory/69726480652.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/43486393992.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2ef704a446ea7fb0b487ababbe60c23f/kidukonajujazes.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/pavuwikez.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d5e153482020927a2f7a00ce712fde30/44077390666.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/9blmcsbocic84b8eckedoscs13/87886577251.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210630_0DFBB707653EED0B.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5jpef1gd68mj2g7vi2n1022og/52317489519.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/vaxegunur.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/vutomo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2c8eebe96609619e480181dec85659a8/wabigidaxoluxerevokono.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 19280 bytes
SHA-256: 43affc3f6ff4d857670935b0beadc978039957bcdf327275ebc488fee0223f37