Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b30245592e5119…

MALICIOUS

PDF

48.0 KB Created: 2021-09-04 17:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df7bfd6d940a88e1f04b18915774d04f SHA-1: 6598361c4c490949aa00a55c676020c90d724538 SHA-256: d5b30245592e5119e0063342c3837d2dd6e7045c7088bb123ca1286374a87368
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to lure users to malicious content. The 'wkhtmltopdf' metadata suggests it may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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 https://drafthe.ru/uplcv?utm_term=wkhtmltopdf+page+break+table+row PDF link annotation
    • http://asid.rw/userfiles/file/13645599581.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daffe8e012---94991935585.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/56703632293.pdfIn PDF document text
    • https://dafelia.com/files/50168180922.pdfIn PDF document text
    • http://emeat.ru/var/files/koxepito.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1u59vf4cgoa24jijlqkrnqhme9/19663305111.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/56428408822.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29204a3a5b---71993876755.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/75397953275.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078db265a103---3581849588.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/68929187541.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/39508477.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e06f2b2690f---60193222112.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2806c4926---xosewedojerabeb.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16121b24a7949c---56277397082.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bj5uc33shviiqli669hn1e7s22/rawij.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/csittpcdclalb4vgsv8hg3g84m/21320095628.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/81721927068.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/gudijes.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/84494420131.pdfIn PDF document text
    • http://adveotec.com/img/file/lifagasiritit.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812801148aa---26577932089.pdfIn PDF document text

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