Malicious PDF — malware analysis report

Static analysis result for SHA-256 41823cb1e6f22e5e…

MALICIOUS

PDF

63.6 KB Created: 2021-06-09 12:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 84d14c67d94cd596b628319eb651a8ed SHA-1: 5852bb947c1fef13697c523df7df8425318cea73 SHA-256: 41823cb1e6f22e5ea5527119cb5ab1f573f380d8925bc3761484a942991abf5c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware. The embedded content, though heavily obfuscated, likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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://smidgel.ru/uplcv?utm_term=nadaswaram+instrumental+music+mp3+free+download PDF link annotation
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ioi772lh8t026cjqigh23np3tt/33342758630.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-24/20210524201933270318.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/9frd8gpuckq3kn6g8sqqucukc7/sujav.pdfIn PDF document text
    • http://samtekelektrik.com/files/lidimisabibazu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/4foq2aamt1lhdvsbg2gubcd7lm/46839816448.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/32c5e5f57f4d86240dfb1ca75b4673a8/kugazabisago.pdfIn PDF document text
    • http://m2m2design.com/userfiles/26867458650.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1d0e5da7---ratugukakikotiwutuxe.pdfIn PDF document text
    • http://www.bash.cl/media/file/13136559871.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1fd01af06---26193285276.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f2b2ea04---25529094154.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/41838024860.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/468f7f2d7cccbfcd87bc93d4ca567e99/niwogelupafulikarupolig.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wegiwitigimuderovep.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/bakajepekidibisatotebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 5524 bytes
SHA-256: 849e0368ad1d202d086c652e99360db7d0dfbcd97be4fd1e9b1301ffd8948ee2

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