Malicious PDF — malware analysis report

Static analysis result for SHA-256 4369afc5a4117df7…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 07:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78430fdcc17849806f095003f78f8c85 SHA-1: deac308c948773675614e69971d543d7499ca1b0 SHA-256: 4369afc5a4117df7fb20cebe4256ce3974528e5934dbb1cf896577d79508f8b1
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. This structure strongly suggests a link farm designed to lure users to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://satisfytech.com/ck/upload/files/1143530305.pdf In PDF document text
    • http://on-video.com/movies/movie_data/file/wabamudazibabizifo.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/20780918171.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb0b2af78---tofikixezumut.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7be7872c7---78299375206.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9409h0lrrjlh3jd5pr48t7i7mt/85136326400.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/6bf9c712ce3a1b3120782404cfdceddf/26824321375.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cd1ca2f2c951a8f087e661d5c17c77d6/zaxij.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/23750520375.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc62ae9227---56024730077.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/dekejisujokowubisurexe.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/39721941884.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38465121228.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/43146367435.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/j913p7orcur4941fo0udu5ce8v/32127898016.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e8693ea43---solawaxexagamazofefujuwes.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1hgbqhp8k2amrmjnm8d9h9s3pv/62991993810.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/4c3f4ba566030ebba8fad19f4387c16e/93018911305.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vekebefowadaguneve.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/jejakefimokuxuzulobogudin.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vizapezitegabezisopupilov.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/km37d0a6iqcqgdfjja9hgp1uk0/29216036997.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/xelawajuzofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=assyrian+culture+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_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 17932 bytes
SHA-256: 2283f00109efd59a492f28718726e36b02df5d51aac17f4a5a780ec0777596a5
font_01_sfnt_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 10688 bytes
SHA-256: 9168af88246a2b7b7a33514eadfc8542007efd4c937038df6ef4e2f9e921438c
font_02_sfnt_off000130b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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