Malicious PDF — malware analysis report

Static analysis result for SHA-256 4688b4444d9aa3e1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-02 13:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d66475a924806d5a048eaf4aa1f938e SHA-1: d187f0cb601d433f20afacf88623990d933c198f SHA-256: 4688b4444d9aa3e1b253538c4da5f94ffac4fe114cd184b6aceda76bfa46b229
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to leverage disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

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://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6qvshjgobidupt5vgel3gpcp87/28946049303.pdf In PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/7eb4fd44a7037f4c06ee0f8fa1e54bc9/misojijax.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/kibonivovo.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/sogidanagidokuderarasuw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14e38e401---zajumujuzuxudipuwi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/24849617e4e5c668519a36294fdf3ced/61012455205.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/85579895607.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5477f8dc---3142122357.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16118940793972---nuduvunivutixax.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8254dacdf0165b66dddac2059e66e557/99220383435.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/lekerabanogemenunedipek.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160791df163bb6---dosobize.pdfIn PDF document text
    • https://shevian.com/images/file/735505898.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/72700159597.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a619ef6e9a9---69324388703.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/pubirur.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/56186878625.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/14808485804.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/46844892458.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f6e5bc00f22766cb1ef7d8ac7cf161b1/30676988859.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108151203527615.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090bd65524ec---28178437650.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/43805033330.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t6diu55dv4iqsdsqp0i415qfl2/77134285399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bushnell+trs-25+owners+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 10808 bytes
SHA-256: bc2464e8479414dd73d9a71b851f605e23b8078b57c33fe61a8e11f9ff3f6351

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