Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac57b0ed27f698e…

MALICIOUS

PDF

112.4 KB Created: 2021-06-15 15:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 80acad97bcf055e68f50c7dbe6dc66b8 SHA-1: 7fd6c754cf6cbd9216f6adaac0ca6c3298663045 SHA-256: 3ac57b0ed27f698e1734e7e5e33e43cd3d92901577fe92f1bb04877f11b40635
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9535

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://irlanc.ru/uplcv?utm_term=xcom+2+cheat+engine+supplies PDF link annotation
    • http://vorne-sitzen.eu/pcms/content/file/12816728164.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/30f48dd3808dec7c09e5c16c30a264c1/93935710010.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609447b0be538---94418522059.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5ifd7tcdbiv9epnfhv0ej3tp3/96513444285.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/df694bgr2qfgqlce3qlgp9k1dn/vuwabopetokewofedaru.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/saxixixe.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a57d2d69---98586119816.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/86205055d901a341250c105f018234e8/tupasuwuw.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/73933552299.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/13703201524.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/36370173853.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/92a45fda83ccc028ad6d2f8c364ce6de/32513265079.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097250226d82---3406817914.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/kedafopufurukidapisepusan.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/v91msujbo8tekfue6kmd77l80o/merapi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b8ed3012e206949c55ca59b1a90ba777/janafituvewokid.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001969b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1969B 5244 bytes
SHA-256: b48c23451951e3b02a003bc880494ceb225e651d54328a4c9bdb742e71bddf38

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