Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6de31c06c53ccee…

MALICIOUS

PDF

54.6 KB Created: 2021-09-27 14:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1619eaf376c008fc75a5f50f35110c64 SHA-1: 99983a2fe108cccd8453545894e08178c276021f SHA-256: b6de31c06c53ccee02cf1b1edf4cb193efd6a9f51cf6395543d2ed6ad99c35b6
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download software from compromised CMS uploads and disposable domains. The presence of multiple links with 'utm_term=download' suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8159

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://thehouseconcert.com/ckfinder/userfiles/files/92837330162.pdf In PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/13451025711.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ecp1djhbci22so8gnathutbge5/12953237028.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/zifubaxowewexozotipi.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/49677042092.pdfIn PDF document text
    • http://js-space.de/userfiles/file/samepolozovemokevuwigina.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0191397869c836970691d3dc0e1309f1/pixemixumomijem.pdfIn PDF document text
    • http://a-pluset.com/userfiles/valoxasomepujadukasev.pdfIn PDF document text
    • https://remini.hu/userfiles/file/regenosotulawetojizege.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/zelimoluzelu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/zujamizokubudeten.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144452157378---kigarevozasuju.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/58997126930.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/dnjnhlaanls1vns97efa9flkrb/vufovaludimisizolofa.pdfIn PDF document text
    • https://cmf8.ir/data/file/nimidutij.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/54201685614.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e439f0389b---68151687682.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/29528147629.pdfIn PDF document text
    • http://pileki.com/imgup/file/xitokefate.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/96186315715.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/rolasigewanixogoxodor.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143a4dd5580d---72633731309.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a1a6cacbdd89afca9788249036c13ec4/vuzenudurok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+snaptube+plusPDF 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_off0000b1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E5 10520 bytes
SHA-256: 786b516f99947c2a203c377c7dfe31fecf993b89ac75e517632127e7669b92ff

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