Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc4dad9a843fd22…

MALICIOUS

PDF

59.5 KB Created: 2021-09-05 02:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31508d3b0a7bf778d062ff8d976b1863 SHA-1: 90eaafb097c5e18d6977a789be18ecce019bda48 SHA-256: 8bc4dad9a843fd22f82738849a22fcd2889fc939e396984c9c823e85e9accf11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7008

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://krisoc.ru/uplcv?utm_term=calorific+value+of+rice+husk+pdf PDF link annotation
    • https://equinox-e.com/upload/files/99298805843.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/budulutosomorexo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d7ee275a75b6b5b8b18e43c95ba9046b/wejajapuzulup.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/jugomikufedo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd90ac1cc8---rojosutametilariviwela.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/89096662191.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/fd5bf3695a9517a385519fd89d2fd1ee/wesuditobewekalow.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/zovob.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/suzegitezoxojisavufomid.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e9cdd63f---zoluw.pdfIn PDF document text
    • http://cy2hand.com/userfiles/zemetodap.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/pinolewipusibagigi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609184a322c7e---73225822249.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/4100750266.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/31ddb3d7de79bcc22e498a389fc0b29d/80220095824.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/nabamowekovitijut.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/52960610611.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/fisubatefutuvujuvamopu.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/17833898635.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zodalawigi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/2996191442.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/tipofujenotufifamomuni.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/togeribasanofepura.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_off0000bdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBC 17284 bytes
SHA-256: 445224710f8244498cb189807c32af2d5778f5c8d72d36f1653cb314f62303d2

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