Malicious PDF — malware analysis report

Static analysis result for SHA-256 40097ef34844e12b…

MALICIOUS

PDF

61.0 KB Created: 2021-06-20 06:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 00d9d399523124d91453f9ed20d285d5 SHA-1: 3816ab7c1ff0011eed8ec79475ea189efda9b4cc SHA-256: 40097ef34844e12b0bc1e8003acffa88b50a9bc65ca562bd061c16f73d1cccd4
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The embedded document body text, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6581

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 http://rioairporttransfer.com/ckfinder/userfiles/files/4149084507.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f708fd0c---xukewiruserazidaxumebixej.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/limalezalafem.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/3c0lr11ng4i48r6q1aqkgg5eqk/maperajerap.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/ximedikikewufezumo.pdfIn PDF document text
    • https://luminex.pl/upload/file/92510998508.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ae1dd2fa732c369b9da7edb6e53f8fd9/dixefetafip.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233a0913a3---fixiso.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/71e3dec971367d378137715f9f0f3d50/xekulibuviririj.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/71517317273.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/60ad436e1ba8e2eb9e785e76dbed6a6e/fimon.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ipc2is9iqdi3r8qiojvfe4hfgn/luturezak.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/0d6709d03f3894a024983e77dee34c93/lobegavum.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/lo75m39hi0eis4gk51guchdf5e/dazazig.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c02348a5c5b---sunomomibujiworamepa.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0998bff0d03635823b474a386332c497/51517734163.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kivugapesakar.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160934bc51eaae---14565910527.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf53daabe8---73084653821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=australian+shepherd+golden+retriever+mix+for+sale+coloradoPDF link annotation

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