Malicious PDF — malware analysis report

Static analysis result for SHA-256 b678e76aa8243105…

MALICIOUS

PDF

64.0 KB Created: 2021-09-12 10:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18015c3374def753a59b7657d7ebb397 SHA-1: 51f22c4ab3a45c9c694a97ad0ff2e28cadab12de SHA-256: b678e76aa82431053a69ac39d0679e904904e0ce0b3be5972701bff743d332e7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of a 'utm_term' parameter in one URL suggests an attempt to track user engagement with specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

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://synerhu.ru/uplcv?utm_term=region+unlock+code+samsung+note+10+lite PDF link annotation
    • http://tostonet.cl/ckfinder/userfiles/files/vipodumivakemef.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/59831573233.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/zexajuxos.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210904110017.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/16789249644.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/zukixawanofub.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/ximukataje.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/bagazitibo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6vu06falct0a80o92dm2dkg1qj/serixajedoroxelo.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/jasodefipinikonopewu.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/47636215334.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vosenafekamezejuv.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/liwufazepub.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/4953989387.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/45598065612.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fiziguweragizu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/det34aiq1i5tqq6k7eti2ghoee/zojuxupunuwukazo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613736b483204---furebolobiwisozufexol.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/33916453057.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/65302270389.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/jidafelarekokugiler.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/75323030642.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/gujisewasu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7c300606---jilofapuxifiwaxozalavufit.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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 11024 bytes
SHA-256: cb9d6b59a39aa1fb2e7d32f87ca37092f3a73967b17ba50273f63a1746261be3

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