Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a722ab37d60c49…

MALICIOUS

PDF

68.3 KB Created: 2021-09-15 22:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f61318dfcf287804a255081478dc971 SHA-1: 381c2ecdb1a900d712b52e6ac9af1e09e3ad59d7 SHA-256: 11a722ab37d60c49f35836d7e812cc23e228cc5d76dd4aa8c2f4d74ae14e86e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various domains, many of which appear to be part of a link farm hosted on disposable domains, suggesting an attempt to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to a compromised CMS upload storage. These elements collectively suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6908

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://nonbodepsg.com/uploads/files/60361492909.pdf In PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jipaxu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/lobazukatipumevajedap.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/93416194427.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/madijapanikagu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f477e960---66673047572.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc38c2518---revokukupewetosusuxu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161305eb4f27fa---48195657510.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/tibuxobewop.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/xolutebanokil.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/34110508715.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210907042713.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ct0vhdbi9c17jsend2bl0kihus/90541442552.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/30724600758.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/9822613476.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/30591357243.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/70085091343.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130dec446819---92032605841.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/rixezevuvuxeneto.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/68113933994.pdfIn PDF document text
    • https://artenika.pl/fck/file/45882327754.pdfIn PDF document text
    • http://machin.kr/userData/board/file/14459241126.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/zikaz.pdfIn PDF document text
    • http://szhlfz.net/upload/vitefup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+slug+it+out+2PDF 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_off0000ce04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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