Malicious PDF — malware analysis report

Static analysis result for SHA-256 00411d512256264f…

MALICIOUS

PDF

48.0 KB Created: 2021-09-06 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd8c0f35f3aae10017d8f2ce587ce679 SHA-1: bc88da735165eb2f0fe657a2af69b4ba234706fc SHA-256: 00411d512256264fe8f1398893719e66a63729ea2729de44abc148d24caf3737
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external links. The heuristics indicate that these links form a link farm, with many pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=addition+and+subtraction+worksheets+grade+5 PDF link annotation
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d2f582637efeea0cc729a13b59e9523e/99931897007.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/zaledatiwaduzus.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/nifulajasumabeloriwiteser.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ab271d5a2822bc5df6c1a3a9b31501e8/44699690346.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/64c754275f4a54e81fdef1712beef7ad/3969573392.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/74f1ad8db4a61b1519203d10bc2ac9db/44741842736.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/88b4cce6d6d7890da5196c6d196db0d9/69971879478.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861b9aa2bfb---kiwijomulaxivig.pdfIn PDF document text
    • https://andrejc.si/files/file/34638684562.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ffcd98508257bc22b06dbd3ebbb78a2b/3271159424.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7e06bc10---46759913745.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/32746107363.pdfIn PDF document text
    • http://gabortech.comadmin/file/nunulasijisatenurab.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/9004536940.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c4f56a35cc7f9d22a68c98d9b0337cc4/42901073965.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0a29bf0c---48080367320.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609468de890e2---88164556524.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/milavezikozova.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5e6d9311---bexamudipumeb.pdfIn PDF document text
    • http://secoinblock.com/upload/files/bupopowadelavi.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/81896649005.pdfIn PDF document text
    • https://stopserv.ru/files/file/69029631420.pdfIn PDF document text

Related samples 8

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