Malicious PDF — malware analysis report

Static analysis result for SHA-256 4576ce1dd4c98429…

MALICIOUS

PDF

70.2 KB Created: 2021-09-20 20:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9ffcb0451b08d4340e75e873c05793c7 SHA-1: ba37b26729bb557e1a3a362add58dfa98b9f2939 SHA-256: 4576ce1dd4c9842923e5dbbc217346806c4dc022f3e3a3a3fa9f672ef3eaa28b
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm. Multiple URLs point to compromised WordPress uploads and disposable domains, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=rainbow+bubble+shooter PDF link annotation
    • http://citadelcaralarms.com/userfiles/file/jerowowokikulijek.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/89284705886.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/napogarefawivesizisoropo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7ef5cd2e---risetiloxugiwaz.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142231535543---4022200042.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/42897899784.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/memilodiwi.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/61341c310697c.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/wabazaxategaxivejezanaja.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/d88h8brakfvpda7mucj3epbpo8/29090982349.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/81158832654.pdfIn PDF document text
    • http://wohingltd.com/userfiles/pabagonevij.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/sinarubegorijilibux.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/44124530279.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109082353057816.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/11139744671.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/73376475422.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/93157523616.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/81643138037.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/dunokapipajiluvamixuxulaz.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/62323320945.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/gijizirapeg.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/nurogitujexivemapi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/86327219f503bcff1ad975a37f7e55dc/loxewugemure.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210919085618593.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 10576 bytes
SHA-256: 20e40345e5e451d768d0c972176a73f4e10abcd8d1abddae8b7e966c73d75e08

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