Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6bad831f6f3837…

MALICIOUS

PDF

44.8 KB Created: 2021-09-23 22:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60628c2915bd68cdf44b3a7ea9bfd469 SHA-1: 0d20e12030bfc1b60173bcf071cc9834d74ac3de SHA-256: eb6bad831f6f3837a11e60ca653a1b7601eccd67626193515aebecc4365ff3d4
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. These links are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7853

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://cructi.ru/uplcv?utm_term=texting+story+apk PDF link annotation
    • http://carszana.com/image/upload/File/73583679301.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kazuborusigelib.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091805220737.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/vazabi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hsmcu4nfgjl7o6l0rhvam0pb23/joxiperagodiruxa.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/27856030704.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84715882742.pdfIn PDF document text
    • http://amdind.com/userfiles/file/30828989974.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/62784166884.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109091658442233.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/sesukinetome.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/numivu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/ruvekul.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/14831266256.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sawutefovip.pdfIn PDF document text
    • http://nscenter.cn/upload/files/rexoji.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/dokiduvifeze.pdfIn PDF document text
    • https://cncunse.com/d/files/pixivagagoponinino.pdfIn PDF document text
    • https://bawauang.com/contents/files/68784329219.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/xanegodobesidotupulot.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161413c81e8be7---zapomisek.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b759d79fbd---66976483242.pdfIn PDF document text

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