Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0053450ee6c50b1…

MALICIOUS

PDF

63.6 KB Created: 2021-09-09 16:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8da09fa39aa97a4e6d0b8cae19e5cebf SHA-1: a51b8aa2f4c4e13dd75f1f00bfba700a02874e3a SHA-256: b0053450ee6c50b1aa344c81254e5e3faf4d2dc5dc1fab59a0468d3c9c8f6e05
154 Risk Score

Malware Insights

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

The PDF 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 ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

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://synerhu.ru/uplcv?utm_term=best+dog+translator+app+for+android PDF link annotation
    • http://altinay-law.com/images/file/25958499942.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/7711871241.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/96332835703.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/89871571794.pdfIn PDF document text
    • https://longhoang.vn/upload/files/80709686835.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/libexutovifobed.pdfIn PDF document text
    • http://momsystem.ru/public/file/89706485489.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/72341775930.pdfIn PDF document text
    • http://nanopena.cz/upload/file/50356680618.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9f98c129---71268572910.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/ruvewowep.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/wizupabudelusavepeje.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/lesuzumenisafiko.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/didugox.pdfIn PDF document text
    • https://bursac.net/userfiles/file/17435891810.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/forevotovupesurusidu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/g1kq3vgcjsqdnp259tmcfhl1d3/ragofure.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c2cb5f5f495e4fb4b835fe85bd009518/ruzuxegozi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/58060314988.pdfIn PDF document text
    • https://forumsevens.com/images/file/693973155.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109010927343258.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ab89a0a668ff3f83db61e3dc6eac787a/pevijazopeganor.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/70e8691664bc258ab4598b1386dfebeb/pirovabuvifafo.pdfIn PDF document text

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