Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a303a6196b39f58…

MALICIOUS

PDF

62.3 KB Created: 2021-09-19 09:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62f60bc1e8c49115a280efb9f2f4b602 SHA-1: f5a4396e2ede9a1c6b48336decb3fd36b93bffa2 SHA-256: 3a303a6196b39f5857ed21840ffbade64a51c11bf2b5ff78376a20767df50313
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6040

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=mustafa+games+android PDF link annotation
    • http://garankuccu.com/upload/fckimagesfile/7958c5be172269384913f6558a9bc99a.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/vikofugebufinozasoz.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210919_FDF748E5C0D345D9.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7d719cc2---96069682072.pdfIn PDF document text
    • https://negaratoto.com/contents/files/68791323334.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/zemuwidisomebilexosedig.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/33907226391.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161446591bea61---39527943891.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa798c300---nivukul.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/27545736546.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/59332609553.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/23973653722.pdfIn PDF document text
    • http://crm333.com/documentos/file/7612293210.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210914_055226.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/zarujafodalalotapeduzibuk.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6376fd3d8cf78f796694b46c7db01068/sojitugi.pdfIn PDF document text
    • http://briztravel.com/upload/files/41110276741.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/40912318183.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb8a2735b---jisosonolofusonobetupaki.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/damufupulegixamoxi.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/xuluvubudaxevisotafi.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa866bba9---31220692078.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109102101131431.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/93081705603.pdfIn PDF document text

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