Malicious PDF — malware analysis report

Static analysis result for SHA-256 628e9b46db7c2293…

MALICIOUS

PDF

73.5 KB Created: 2021-06-26 03:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 220b2ee34f7af9e4659cdb71172ec388 SHA-1: f3eae6a3317cb77911a46b0d0d1d81cb145021f7 SHA-256: 628e9b46db7c22935681d3ff88410d4c98f29afad9309f3c7d7c508796de7ec4
154 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, with many URLs pointing to compromised WordPress sites and potentially disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware delivery. The PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6573

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://medvor.ru/uplcv?utm_term=lean+startup+movement PDF link annotation
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/rakamitano.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/zodik.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/91ceeecc0073477a46142a53adffe798/lemilipadatemixetem.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vusj1ut20viajojn823lebrblu/15676462186.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/waluwuz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0f5027e8---diwaxukija.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/04729ec7da395a95ea92ccbbc62abcb0/lusedoz.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/rafaruxolukuremakovoju.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/79634246335.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b0725c14---95924611288.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/84989183609.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/jitarupegidozemizilirikev.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kjgb49ci1fkp5tgl32bdjm6tlg/81640258289.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n3s7i2vvrrmvqn6serap0c1m54/40342061874.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/i0uggphmas0qie8qdi1ktltl83/lovoxoku.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076314ceaa97---siwaxorinivupokaxi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac866f68c---gozofiwo.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/81674143365.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lirezinogepojigubo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16096416ba7e42---49308122464.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/misogawutamisuminusisode.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/lifuripovugapofovim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe42be6b3b---81229918543.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/56d61071a9be7c025988ba1c8fae5008/59066785123.pdfIn PDF document text

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