Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fd0670039cfb3b…

MALICIOUS

PDF

69.8 KB Created: 2021-08-20 12:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: c95d320f74c463dcd8f73b7fe51b6b31 SHA-1: 0b306c966cb574f9072e917d773b21df0aed1b24 SHA-256: 23fd0670039cfb3b932ceac0e92a3b6d4b3eb84ce21e95d5d0dfdfd2eefd43c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6434

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/604794c4cc3299e18ecd1167b9991aae/kakib.pdf In PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/49235292811.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0fceeb909---31304909660.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/85045707490.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/65711071890.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/kowuzexulejavaxew.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54501870400.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/19785170735.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610510e10039c---64080486102.pdfIn PDF document text
    • https://mvservice.it/file/wepigozusoteguliv.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/lugoxofeboparulisatopip.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/sudarew.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e34e85e441bd0aa09cfc72a766d5a48f/rilujigijifazuromiretiso.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/29750625423.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/52710167621.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/riwarobixelopina.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e79cdf924---losejuzikori.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5fdba1684---86442485883.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/58ae2790454ad85fd17dbb5df34e945e/56663739159.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/jitukefesotemapeva.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b26568ec6fe---2979698211.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/nerexunofajilijavumofib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+the+summary+of+dr.jekyll+and+mr.hydePDF 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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 11112 bytes
SHA-256: bdc16268879f781ee65b347e4b45b1befe12a29cfe3ef75cd29af73f1964ae2c
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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