Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4bea9375669ecb…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 14:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e1bdfb400da6c67eff85fefb97de30d2 SHA-1: 43086fdec03a02339ad8eca277b31d72bc2031e3 SHA-256: dd4bea9375669ecb3c6e752001defdce87f826c8cf2b4707918132011cfa500a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to disposable or compromised hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded URLs are consistent with attempts to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7545

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 https://dortmundpools.com/contents/files/12872109608.pdf In PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2atcprmjevfihidd1aucsai3fm/jezidoveva.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/86162327309.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/xebupomiwigesa.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/puxedikotupufedov.pdfIn PDF document text
    • https://projetovm.com/uploads/files/lafemumotusu.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/nizanurebizexolalamokukug.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/setuzonasonurulikaso.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/15166979013.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036caa22ac---7184900138.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/35481073000.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/junonir.pdfIn PDF document text
    • http://hoachattn.com/image/files/65838663429.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/texubutudanalibik.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/famapudalerofatoromarosog.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/7207555943.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/7351364161.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161382b695c4f5---loguzabepojawat.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tazobized.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/43007821101.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/17137591810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+rainbow+fish+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 18024 bytes
SHA-256: afe8de3d77f70f4cbd308181fc10b231e14832ebe08e05ab7d3eec905cc64dd2

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