Malicious PDF — malware analysis report

Static analysis result for SHA-256 3095b5f62a6384ea…

MALICIOUS

PDF

66.4 KB Created: 2021-09-17 06:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e3bb7719fd440fa53e31667dde8eaf5f SHA-1: 82927a4fe88edbeeb98116c9a860de20ea0241b4 SHA-256: 3095b5f62a6384eaea507dc3b86463cfbb42122e227864c6bfcaa06ea7557762
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://minhgianggroup.vn/upload/files/dewevolitotus.pdf In PDF document text
    • http://jmyhship.com/uploadfile/files/72155831601.pdfIn PDF document text
    • http://remobudostol.pl/pliki/manoxizefupipar.pdfIn PDF document text
    • http://thevale.us/userimages/pebopanu.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/boxutixidoru.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/pusetaj.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/28558336219.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/famizikexaleko.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/94820459004.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cefac1cbf4---16872965338.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/96674689160.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/wosezeron.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/podevezerefalekubum.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/90879217441.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/8046543955.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210913223013.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eada898392---mizuwanav.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/xiforu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c6d25b76a0bba27a8ee91004d9669ddb/5901031005.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gogiguwazetu.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/gasujufipipugof.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/xerunazase.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/93520794709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hatsune+miku+v4PDF 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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10332 bytes
SHA-256: c2af1a3680f883228457241cf3972759dd2f529e6d5fdb5fbb5d50cb4946ac48

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