Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9b3ea0a2fb564a…

MALICIOUS

PDF

87.2 KB Created: 2021-08-03 09:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30f458a4b58d4e67adc14f569425cc4f SHA-1: cd93654bcc8fcc9aa109b4aea9b394d1dd94a077 SHA-256: dd9b3ea0a2fb564a4aed61377298105d176861099d47fa59f5bf76a060e9f9c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious or phishing sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.badischer-kunstverein.de/ckfinder/userfiles/files/8213892692.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabede7276f---kukusitofibamitokava.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/93735013418.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e971e20a7---lisawosifono.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/70034379225.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/lorerarubukelufun.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/97949619367.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/27578167350.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a449e7aa325---18101463700.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/66fc6a7e5244a75a04b2f2b31735d27b/15830612665.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/20655211796.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/55590359103.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/14119304368.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd10fe9b04---52363047378.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2dd8d4139---wijeleb.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j1mdcn6ia58attd7e8rtjje7oh/dofamo.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/85239529d76b72d34051c9fe5c8463ba/zamozimufamazoridigenado.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/92550037543.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c49263f05a3---45474335453.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7df88a5b48e9cc833518b6d7fcd24181/lazaf.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e24c755a24958e14671c788d5b665369/wavukisita.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777f3eaf3e9---83860267112.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/22106051606.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/74304314023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cuantos+pies+cuadrados+tiene+1+metro+cuadradoPDF 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_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 17592 bytes
SHA-256: 41c62efa0b0cb78344cc4530aa4250b60ceb91d1d41234d7dd7009ffd05dbdd9
font_02_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 10812 bytes
SHA-256: 24df8d9796c0043e5d33cb77533c2cbd23ae14ce3f7a05716dc8c6578ecd3ed3

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