Malicious PDF — malware analysis report

Static analysis result for SHA-256 5405b24f024f4eb0…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 21:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eefcb2d7588cc869532647ea15cd06d8 SHA-1: 37f23572e3839cf351663dc21a76ee65f45a87a0 SHA-256: 5405b24f024f4eb04de1c8b7a75209455c74120130454f55f1a8d990718836a9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other PDF files, indicating a link farm designed to manipulate search engine results or lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://canigrup.com/userfiles/file/wivenusiz.pdf In PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/290893uhqfd2ube2vgvpjddsj1/5717705442.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/vujadis.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/5778037246.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/g4kp04kijoviltfcuvlvseg254/52060439525.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6f46e98f---68086926354.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3b1533784---17722120174.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bd1076da78709873ae71f64efedf0f3e/bufemom.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s2tflvqjmjed3e6ubjfnmi190k/pilikinuzojitevuxeluwir.pdfIn PDF document text
    • https://sbufficio.it/file/37255050184.pdfIn PDF document text
    • http://falerisztika.hu/tmp/90365011358.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/20055947762.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/sujipuko.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/46908a8a8509d4af6bb651a2cfc77c37/zisebexoxokifeg.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/vovogekodedi.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/ribibisivudezegivafumax.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/20622356038.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/gavaturuvavumugijepud.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5561e2813c5c5367feb6c79619c1a44f/vikosuvusarurazozipi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140fb6643d---tiruk.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6a449f636---sobipus.pdfIn PDF document text
    • http://lucann.com/Upload/file/10517458880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=penyebab+steven+johnson+syndrome+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 11076 bytes
SHA-256: a84493dbff7cd302ccc9e81206b34c8070c7eebd5eb6d397c6f722a818038f61
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 18888 bytes
SHA-256: 79fe59791ef8de7ca2f2e0f1aaef079bceafe07243ee5ab89c04008e4268c177

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