Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc7d0c2cd1d89f8…

MALICIOUS

PDF

62.2 KB Created: 2021-09-19 08:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26056366a9678c001527e823db03fcd8 SHA-1: 1815901256c6d291f32663a95d71f7b6a5806512 SHA-256: fdc7d0c2cd1d89f8c0e3aede37227e934b812b4fcb2d62c128fa4a02ad936def
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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://synerhu.ru/uplcv?utm_term=app+lock+latest+version PDF link annotation
    • http://kassa.pl/userfiles/file/savujobulovolizem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d22cd7eb4---tuliribuvofemulezidifaxub.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/16017098099.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zemexanukamulomex.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/79270920924.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/64662176538.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/14eb868602ba2e26cbb18b5b5f0a5f8d/9117258369.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/vomagugegideso.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/62083653622.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/63290698660.pdfIn PDF document text
    • https://banghenails.com/upload/file/nirak.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lexov.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lamk25rprhr72dputtd5v7juj5/julazixudogimanoxifipeli.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8d0abcf3b91357e5dea6017453f67cd4/47119121560.pdfIn PDF document text
    • http://lex.tj/img/file/wibovajebokezijo.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/86596330922.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210910091800.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/nujepiwugesebalapabegi.pdfIn PDF document text
    • http://halanmilk.com/upload/files/riwepanawo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb378d4bb---10211279075.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/46155509035.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/pakubaf.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/30040630532.pdfIn PDF document text
    • https://inarsindbari.org/uploads/kinomasatukepa.pdfIn PDF document text
    • 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_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 10508 bytes
SHA-256: 7106683a3c1018609eef5922c0ca027668198447aace50db1a31d67d3cbba326

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