Malicious PDF — malware analysis report

Static analysis result for SHA-256 169aa17b2e7cd0cf…

MALICIOUS

PDF

54.0 KB Created: 2021-09-19 17:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33c30d176e56fc6a45729803fa9a4a46 SHA-1: 5a241651496f33fcc05a42b0ab3ba7fbb7e4ad14 SHA-256: 169aa17b2e7cd0cf13af9da3bbfa306ed4acca8d12e06794901fd05ddd1fd139
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 upload directories. The ML classifier and ClamAV detection indicate malicious intent, likely to phish or redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6787

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://longarmquiltacademy.com/fckeditor/userfiles/file/sopari.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c04d21d3b---25351680232.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/manixar.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/2810233247.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/varomeme.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fajozidowaruzuwewuriz.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/bezutewawukid.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/10566429527.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/36113496250.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/81644380738.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/filikomati.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/pofak.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/87285010990.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613798d05b65b---28267463768.pdfIn PDF document text
    • https://laser123.com/geektic/files/bipijokenugopog.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/74905393350.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vonuvoji.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/62711097296.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/37152558212.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/54178295710.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h3ld07aoblo4liioou3c5r7s9h/67499109230.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/merevodawadokozuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+share+data+from+iphone+to+androidPDF link annotation

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