Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca81abd08be6cd17…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 14:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85488a3dc8b3b04e01738f55afae5289 SHA-1: d9aa11aabd4116ec37f595975a02ac20aa99277a SHA-256: ca81abd08be6cd173bd1f332efb2d3ea858158fe36a2c1c4cf314709ccb1d470
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The file's structure and URL patterns suggest it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4513

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://queure.ru/uplcv?utm_term=jlpt+n3+grammar+explanation+pdf PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21947b8a7b---83414999710.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/74966957129.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f076adbf8a0---bopefusu.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/20517452151.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/18mfklgqtan0i8vsoa0lr6gg9v/85437507800.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/razavasukexuwamuwipo.pdfIn PDF document text
    • https://cape-electronics.com/media/file/xoborip.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/xaweli.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/51937337485.pdfIn PDF document text
    • http://liily.jp/upload/file/20210818035726.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e1901fbb8b46132957ea68632b11d8d9/5213694219.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1b589ad02184b4aa5557cf1cc685aff2/24733343645.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/taloxesivurenum.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/43844887881.pdfIn PDF document text
    • https://thietbigas.net/media/files/rijus.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/pofuxadesubuduvatoreji.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xujijizabokepajanixif.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/av6rsg2ak52jr3k1n2848apdq6/mamabovizisipa.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/razug.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0383076001625293272.pdfIn PDF document text
    • https://birudongker.com/contents//files/52032713197.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/leruhm6v2gq5junes753gk98gs/88647326258.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/zegovalufuxi.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/70985869791.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/108facc7eb67066f9e46c10cf786d01d/digom.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5ae37d61---92682984757.pdfIn PDF document text

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