Malicious PDF — malware analysis report

Static analysis result for SHA-256 638fa458c3d32d02…

MALICIOUS

PDF

47.6 KB Created: 2021-09-20 06:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71653cd7b5bddea93c5b6f16b02492bf SHA-1: c7ccc546a41bf68228bce0e7da584d38ebf7579a SHA-256: 638fa458c3d32d02297a868b764f0a87600f809ae2e0d49f502ae22e36b24a10
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 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 malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6210

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://insp.biz/img/file/rovubewila.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rii10ccpdbtasp7gvc1a264nru/24186180212.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/fojaniga.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/35544878043.pdfIn PDF document text
    • https://t2sc.me/userfiles/seremosovururafawi.pdfIn PDF document text
    • https://phr4u.com/files/sozawuvonopovuduv.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/junuramefawidatulel.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/32881591184.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bixifusomekufuma.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca5784897---45377914235.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/jogid.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/49201096211.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/kifutunomilivulolepex.pdfIn PDF document text
    • http://rjt1.org/upload/files/94676854733.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/juvud.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/wajitokaditak.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea69bd4217---33440250216.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/gusisagemixiv.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/disugurojerumewetobuwi.pdfIn PDF document text
    • http://kes.org/upload/editor/files/9872724355.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60f087d3f69644f8f8428cec7ec65374/60273587256.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/bijikotidat.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/rorumufi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8188e4073801653d86585de1130279dd/nepusisirurijaw.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/44414801455.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/wexojuban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=assassin%27s+creed+valhalla+apk+androidPDF link annotation

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