Malicious PDF — malware analysis report

Static analysis result for SHA-256 4306b1a151908fb9…

MALICIOUS

PDF

84.5 KB Created: 2021-05-16 09:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c19492b243e4ee36920214fb87d0e76 SHA-1: bd876d68310522f963f114b0a20b53e8f31696c1 SHA-256: 4306b1a151908fb916a04fafdf37cf222636345ce566c8b27e37aa364b254564
154 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites, many of which appear to be WordPress sites hosting PDF files. This suggests a tactic of using a link farm to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8245

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=cahier+des+charges+informatique+serveur
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe54635d3a---tusozaxikejipijofesawoza.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/9667243027e138a27c25efce2cb9ee15/gegonamodanepomilegovemo.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2bed9061---20927592525.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5ac5090d---92399669493.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b4c4085c0264c0d8e643d897578181a8/deropipanapusone.pdf
    • http://ankurgroups.com/userfiles/file/xiboranunux.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089124b8049f---fibosazipimowi.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16080065568bf9---matuwomagep.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bd964b2f0---vekumepajabo.pdf
    • https://contabil-fiscal.ro/mm/file/65178485387.pdf
    • https://anmoul.com/userfiles/file/vofanunisutiwa.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da38758182---16794513809.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7206fc54---teketub.pdf
    • https://asthasupermarket.com/userfiles/file/16151236246.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fd9c3fe58c609115b86812dec016b670/diwudakitesizikop.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/5hbkl3cncu4gf7ojva0njl4sni/14683339139.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/hhivebkgn2oihscmejh3f5dh59/koriw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012363.bin
88edaa017f26433d5f44fa08fbec516f7ad9d7f001edd87c16f71f3524fdf6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 5496 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.