Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d90edb8b46a44d9…

MALICIOUS

PDF

58.1 KB Created: 2021-10-09 05:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c564624adee0480cad4a73fc3d1537a7 SHA-1: c26d70a78a509215792cc1a6d386c2a0296f62e6 SHA-256: 6d90edb8b46a44d9b4cba0381b8a5ac856a4a42acd901ba08de99630a3ccb938
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript and the nature of the URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8155

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=asexual+propagation+in+plants PDF link annotation
    • http://cftckr.marketsearching.com/upload/files/99211692263.pdfIn PDF document text
    • https://rosycaffe.com/file/kuxitiwowisanometunokeru.pdfIn PDF document text
    • http://samtle.net/ckupload/files/31044608194.pdfIn PDF document text
    • http://kingsshopping.abwingsmd.com/uploads/files/zoropo.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/nobezufi.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/77344774275.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/97395849819.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/rurabosolowixo.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/paxepokomurisipunarexol.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/wubiloxivaj.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/biranogedovaba.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/29494239453.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/17576594534.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9ab873957---58864480469.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3d65b421---87917336688.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/turubaf.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/72908057126.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161469391cdb5a---nobekezasetuwus.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152eb6367879---65387933002.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/69931220480.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091003123173499.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146f55d199a4---3411105676.pdfIn PDF document text
    • https://timminsrenovations.ca/file/swD3FD5Zj8iWx1bh.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/34554516392.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/nopavujinasemajaxudiwilej.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_off0000baee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEE 15436 bytes
SHA-256: f95d9370026db63fc7a31c37720dca40ebe44f9d8d8a87e201d3f4f485212cd9

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