Malicious PDF — malware analysis report

Static analysis result for SHA-256 16688e993207b130…

MALICIOUS

PDF

58.1 KB Created: 2021-07-04 07:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0fff0226521837112a4f59f01e8252b SHA-1: c8cc1040f3c1284c2deb77243bb686f790c42ae3 SHA-256: 16688e993207b130fef11b514dcc82b2bdb2e94da5b3e4ca526948ff96d6e075
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting sites. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5801

Heuristics 5

  • 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.
  • 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://master-sign.ru/ckfinder/userfiles/files/36858529679.pdf In PDF document text
    • http://auto-spec.ca/fck/file/91832261147.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/72128996246.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c76864e66a---71029529912.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c80350f095bbda09d91e4629a408681a/korosusajajubexep.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gufuzuvef.pdfIn PDF document text
    • http://blueyee.com/upload/file/1718130116.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/35383116463.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/84730095516.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8e1eca02---38369275419.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2fe43a415---xatotepox.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xexowerigas.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/3126433591.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/88404883531.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210630121107_2gs4n9.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/qee1enca1dj8e3jd244gmncj23/51274123279.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/401l7cn3oa04skv3tjvul3c4vq/rudavif.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1abd49c81f714841b1b2a6d29721d528/wisonape.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/34bfdcef66a57fe31b63a032d4a1a3e6/7965457440.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ae2b86o5sdd25mnc701echdrnm/jesuwujekamajoxodef.pdfIn PDF document text
    • https://ancoraeducacion.com/images/68971439446.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8e28123f82bb23fa31c224d3513845c2/42040997287.pdfIn PDF document text
    • https://dineflon.com//files/duxomanupivikira.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/28916338912.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9ftnvdj4bljhd0s1090n3mgtka/6892719234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=number+of+letters+in+italian+alphabetPDF link annotation

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