Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48c6e111cef0e9b…

MALICIOUS

PDF

56.7 KB Created: 2021-09-30 12:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: efffd39684950a078a6ce76d76ba384c SHA-1: 05d730b7229f54a72100c3027b63304297ffcbee SHA-256: d48c6e111cef0e9bc64c86f4f0ebba172f1d42cd8ab1ad3cf4a708df64df6c6e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8953

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://luiginoiobbi.com/userfiles/file/wekim.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeeea28e39---26084380583.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/54710634166.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/zetapoj.pdfIn PDF document text
    • http://erdbau-rauch.at/boxunemurabutifalupeja.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613dba00ea1c5---13947687344.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/027dc6d693bfff49721225802f86ff44/86101841956.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/29449268169.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/monirofaza.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/32737946290.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/zuzumelorinek.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/vinokojejelevuvogobil.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210903_EC7381E7F88C6E3E.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/banobedomoki.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/18806510967.pdfIn PDF document text
    • https://cncunse.com/d/files/bujavarubapixi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a196453a9ee4e2dcff4710f79ef059cf/lapukezepe.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/lubexudagedofeme.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/54442648072.pdfIn PDF document text
    • http://briztravel.com/upload/files/kexedaf.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210916210925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ultimate+alexa+pro+apk+downloadPDF 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_off0000adde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDE 16800 bytes
SHA-256: 51a9e4a887ced265e8bb19ee956ddc9707446fde5ccd682e77358f1eac658c52

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