Malicious PDF — malware analysis report

Static analysis result for SHA-256 0303e91da1a97523…

MALICIOUS

PDF

113.8 KB Created: 2021-08-07 15:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4248f5fad2b4d0036be91f7a5850ea5 SHA-1: cd9d30024fd124af04b914e6d7700920e7cf31e1 SHA-256: 0303e91da1a975233e734af813fecbeae3fd1cca654bb2d68fc2c9e384fe73a8
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites, all serving PDF files. This suggests the document is part of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6471

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 http://virus-safe-zone.com/ckupload/files/lufalidavipi.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/bukilug.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/39364386575.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-1/20210601163325635352.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/mufudet.pdfIn PDF document text
    • https://tonitomov.com/picture/file/4200277779.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/t44gqguu7o77ailpplbsmj3u81/biduzilevapuzot.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5649118e6cb7560264efc60601e563b0/36642097762.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/62662306888.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160790f8d02ba5---39673187191.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/68001151247.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///6503353207.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i2vnr70qutkslk9se5dod98us2/tikanigugu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/63323623782.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/27327741034.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/garifujesajetimalukiguw.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f2ac3d8f85005b677711d359e591d11/patop.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8a20520f---45614655296.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77b7caf160---28740403320.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tegotuzabupawudikebunade.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d4140e8bce633638a57813666a9f4ede/78967049059.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160850b1b787ce---13036262667.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/97236793574.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/63166079238.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7d12d674---manabudaxagi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/pockqroh8a81ia32qujeskscr0/kadekizozoxunusukomobewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=statics+and+mechanics+of+materials+5th+edition+answersPDF 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_off0001a02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A02D 11036 bytes
SHA-256: 739755c4de1dd9b12e7f3cdf54b563f365fc61f5e0a270d9aea068901199778f