Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88f6c644762851f…

MALICIOUS

PDF

62.0 KB Created: 2021-09-04 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd7b253d5f46d5313d4d74736ebdc085 SHA-1: 424435ac61b3cb2dffd847a2a56e789cc8a85d2c SHA-256: f88f6c644762851ff074e8a4507004938b26b1a621a99edfac6cd3e0e834555b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The embedded URLs likely serve as lures for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4857

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://garglob.ru/uplcv?utm_term=neumonia+por+aspiracion+en+ni%C3%B1os+pdf PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e2697157d22315cd05a753968f664895/bugemotan.pdfIn PDF document text
    • http://coumert.com/images/file/28601249051.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2439ddf98---43957807230.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1629903921.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ab09ca1cc8e7f80d6e2df2e01cdf001e/59473800135.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/31473015122.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf901d697b---75037733745.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3je51kvvtoqic2vra465irbgb/30402851363.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/88467512920.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/94861470131.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/madupetazujupol.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/jawumu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/33169391335.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/50262242643.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r513g2lqvhjourslm96ekn0snv/17041295349.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/20054657668.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098295742cfd---zowujojutilexikexep.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d0a465f5b7b1cca3bc0460135bd32f4/tigazedunuvisu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ijj0mmuf6m8ima6jdfkvgrd6a1/pevedazi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd472bb2765---76636990511.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7ca3c6d02bb6cbb72fc270bdb698cb0b/96757008735.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/19230689353.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2069115005---vajurusasedu.pdfIn PDF document text

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