Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0725f06f9cd35f…

MALICIOUS

PDF

93.7 KB Created: 2021-08-05 03:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2241fbcd7d244bba0e83bee3642cf30 SHA-1: b0f26d934fb9015b6b77b51d4205d20009eb676a SHA-256: 3b0725f06f9cd35f579450086d90756a6d7f38a877538dfa1c7625932a8b1371
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a PDF phishing trojan by ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, likely to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4260

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 http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fec2eb0af---vekibuwerinupadiza.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8a103fbb330c3b5321f902f0685efea1/72430574367.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/vipedalovajogatuxok.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609481dc545a6---38848457225.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1d64fdc0f0838aac609ab65173043e83/jetobovanoretiwijazoz.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2684f73b63f7951a83414275742da7b8/mutafabodebigijedaximos.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/41404916613.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/95269471545.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/113e4a192a2f09b34a634d22aba2e31b/foduz.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/90243731595.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608336648498b---gukikexasijesalaxokuka.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/555c8008d734aeca4b6b5001cb08e86b/jinifobuvabulodegixoma.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/95370464682.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/tiduwade.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9edbd063---92424288588.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/6a695b1ecfe8c37a7070161487cc6c02/kogobexexaworowime.pdfIn PDF document text
    • http://slsnn.ru/content/files/valebeni.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/tobivilaxibe.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7f472327c92400dc686d00e76a241be9/48691437401.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6cdcbde3---zefis.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607158f7dd3ef---dupinarexojanevobe.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/73ae9e656464fc18ce5f522e3e0c2b96/roxux.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/eddkdfqngsph8r62oncud17dpb/bazalajavetusuwixoromege.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/47779925726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+exercise+for+flat+stomach+after+c+sectionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B6 17252 bytes
SHA-256: b399626a56d866fe52c2142bc6c1ed6ac56a5dd93664d093a8b7af12348bf928
font_01_sfnt_off000150cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CB 10756 bytes
SHA-256: 5f43795c8d189d9c6a9048de504ebbc298fca6833b36cd29d1bb62883c84fc51