Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd57188db24dcabf…

MALICIOUS

PDF

54.0 KB Created: 2021-08-15 19:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 396222078023ce955b04006f39e60aa5 SHA-1: cd08d49f45798d6fc3cb0b14e472535fb0e31da7 SHA-256: dd57188db24dcabfd13a679227fee29664d1f2e4c65568f2da4dd131ebbeca5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9041

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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/6efe61719fa98d08d0fbeddfcc4ae88f/firasirafupumukafabe.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b87fcc120---sijidugivozekulor.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/lifuzanut.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/rofisozetetiwexa.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/mapobazugideli.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/j8p6n3p6pc1pdhn0qoibmk8pc3/8217283547.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/gipoladubep.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074089c65170---xawonomamumarerewasu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021080213030473499.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/41365523986.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/vemasopopalafetojupol.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/81690460395.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7639d255c---87480138092.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/xefijuforoziseneru.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076b27dcd933---17367167673.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94417274---demoramiwawagavilexo.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/27357566322.pdfIn PDF document text
    • https://yuss.it/file/bokepoxutar.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210801131825370.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/11791ad811d42b896ddcd74e2c18d8e7/99377513927.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/goxolorulamomiduxo.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/48712407649.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/5283194093.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/85740755770.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/30688847326.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/67461916588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=libro+biologia+y+geologia+1+eso+anaya+pdfPDF link annotation

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