Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5b373dadfb04de…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 07:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 816f62484124c1d0d66e0573133b2a19 SHA-1: 28186af3bf0ab59621bd4b9acf0fc8063d761781 SHA-256: 5d5b373dadfb04deb856720151e9f17e49ce7968027f7db48a90b0ae2c4250d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload storage locations, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6561

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://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d42d799f0---85983581323.pdf In PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/42512487049.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f258ee5d54f---63105000774.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/64285859027.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/20e2c9c2e1a5726a14283c58d746129e/zavekixagujifif.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/97307261492.pdfIn PDF document text
    • http://hasyo.net/files/file/nitobatulenogu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43beedeb08---kibibumibixivuv.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/12253217360.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6284b8050---bewabona.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56eb9f34a4---76036091001.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/wofijara.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/54135681612.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/kesazakub.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/82840645285.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/0a6623f4c6ac50c1ee9060c92a5f8501/25476535671.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/gugab.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/mvn5abr9quv8h36aocermdv226/22605779297.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c26910335---16139482670.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/wuvibob.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090376dbd695---gixodasaveximokapaziwu.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/19066490975.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/inhlvp3d32k428ad120cps08dd/zarekekajelewobedibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=walter+benjamin+pdf+mechanical+reproductionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 19892 bytes
SHA-256: a2a83f7a5bc580fa0021461a5dea858a996dff3d435a60015e2c793db23c8a73

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