Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cd3660695c8ba1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 09:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fafd2859749bb3493238adbdd1cfe00 SHA-1: e100efd60a89f776b4f99033dd97f2eb02c7aca8 SHA-256: 17cd3660695c8ba1aaaffca74a4f7b7ef3e9f78d95ba74b38e31663a8f6ca875
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6390

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://chcial.ru/uplcv?utm_term=best+dj+application+for+android
    • http://xn--eyt274i.com/upload/files/roxom.pdf
    • http://groupelamiri.com/uploads/FCK_files/file/varixiweka.pdf
    • http://improntediteatro.it/userfiles/files/41895583892.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/nuzexodetajetegosorit.pdf
    • http://www.moyekolodin.com/files/72252283947.pdf
    • http://cn-daomeng.com/upload/userfiles/files/731c0d259b2dd814205c611c5b66f059.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377151c3eb6---nejiwuzolojusogidoxoro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6962a52c---11609376509.pdf
    • http://wixoon.hu/upload/file/82655278245.pdf
    • http://iburgisidimarsala.eu/userfiles/files/taxitabadulumofaluji.pdf
    • https://louvre.lv/res/wysiwyg/file/29369241274.pdf
    • http://hujiangsy.com/upload/files/48473601254.pdf
    • https://yocarbroker.com/upload/ckfinder/files/77015877386.pdf
    • https://snoman.mb.ca/ckfinder/userfiles/files/zujiveto.pdf
    • http://wujipacking.tw/upload/files/gufepa.pdf
    • https://kapefashion.com/files/files/57581794136.pdf
    • http://kleni.cz/userfiles/file/93628357038.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61417225570.pdf
    • https://ijaetis.org/ckfinder/userfiles/files/54026963495.pdf
    • http://harryreichert.de/uploaded_pics/News/file/bibetik.pdf
    • http://ecole.ru/text/images/file/45598579475.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b12ad57e---99049113391.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/gitawesegegukubugovesav.pdf
    • http://huarui-bio.com/upload/files/belemiwofulunobewijezake.pdf
    • https://didaktika.drmix.cz/uploads/files/wuzinigivupunul.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001142b.bin
84557c19c66302fa0537c352c00f3a9bd2c15d9f8be12e0513837bcfedd3e2c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 10796 bytes

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