Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5bcb6e382caec6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 05:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85dc69739b9b233fd96a6a1f43d9db61 SHA-1: 4af54c9eb05c49f44eb257ac03c425cffc465a9f SHA-256: fa5bcb6e382caec6799dc8f4616294a80fa441e3c6fbc62121ff8416c52c9612
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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 https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7e471c1e0r7bcncrlv2a9blmh0/gigasaxedarivotosunip.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8386cdd46f---55541156829.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd366cf384---jefuz.pdfIn PDF document text
    • https://majubesar.info/contents//files/92187538107.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d46f043f4277d7c10ee5be041dab1d90/58270843215.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bcd7b685f---30289268345.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/48195189841.pdfIn PDF document text
    • http://71mhsreunion.com/clients/f/fd/fd19d29f3ef40f7e1d0269d1df38e7d4/File/suveziwolemuzaradokosonav.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jamakilopidojid.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/vajanezepirimatugud.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/36921201562.pdfIn PDF document text
    • http://msiutilities.biz/documents/devegomot.pdfIn PDF document text
    • https://ccskin.com/geektic/files/64111496910.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/s2mhuno4ou5l2s1d9pquq64507/35463319735.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97791f0fb3---70170638260.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/gimewekotajewagake.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/12457218823.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/demasiruziwonezokemaban.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/futogesoturonotaridi.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/85697544201.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d0a7fd3d8f08cb19dcc263d6e23b9c5a/gibuviwepalesasuboja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=modern+plant+breeding+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_off0000cf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF97 17516 bytes
SHA-256: 784aec3e11f98a029cfa4d540f583a111913a778aee70e53966ffe9d8c32432c
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 10640 bytes
SHA-256: a2b2801b42686d9e805e67c9db022a4d1b1eb8b23121b626060d85f505e7f636
font_02_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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