Malicious PDF — malware analysis report

Static analysis result for SHA-256 740c757d6aca9617…

MALICIOUS

PDF

62.3 KB Created: 2021-09-18 19:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30f49f424a78cd5797a2bf5556347f07 SHA-1: 7cc95c46f9d9f38696bd36f4a6dd4be4b226d582 SHA-256: 740c757d6aca96176adcb7b00d8f2d4e012cb668414bfe0b7eaa42c4a779f710
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6040

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://crewmak.ru/uplcv?utm_term=bedroom+in+castle PDF link annotation
    • http://efrex.cz/files/file/dixawekedikatemub.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/jisazezuxofudopelos.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fusinumitufajebigavu.pdfIn PDF document text
    • http://www.andreapondika.cz/file/70941105190.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/00f48c8fbe23704c3316c6575496f222/kozojujot.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/powifasitokuwo.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614590c55be67---zevumepagizojogoledi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613757bc25ac2---14098226806.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/taxajan.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/26444229630.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76227157706.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/nimezapawamobix.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/baveradepivevanoku.pdfIn PDF document text
    • http://knipia.com/userfiles/file/kafarelolewux.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/25896926105.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090210042812.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/rivokinokexixafulob.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b8cc5b82cc6588ff71272e832041cafe/89019504000.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/zugipagefiroma.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/13581441739.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/13945363414.pdfIn PDF document text
    • http://pb-book.com/user_file/file/molavivigeraju.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/93419987142.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/55704075487.pdfIn PDF document text

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