Malicious PDF — malware analysis report

Static analysis result for SHA-256 75098eb9823c9718…

MALICIOUS

PDF

91.4 KB Created: 2021-07-26 12:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3de27329614d6312aa6706dc28e17224 SHA-1: 20afade100eb02ce6aee8c222825ba92c8c64b46 SHA-256: 75098eb9823c9718df5270ecedb03a3ca15f50f2be8f50da1fb581cbb7246d38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/woladogiwo.pdf In PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8lnqp9omojekhpqlmajohpf6mo/39500582908.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/22602647478.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0723119440---jazusokakafis.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c947559ff6---61402629458.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/93558256384.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/48f26e3f42e1db6955b6374d0cb7bac9/jilujasawufubifapimut.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/54475800666.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/anlhpl903208ru8b6ekbe4qu42/75572753874.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90739cb3de---molomemidizolirozonuk.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606de5aa30924---9872750008.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c777dfca5f5---pekatovilenanamix.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/puzaxovuzula.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/17bl53uh0k9aic2tnfku8ft519/93181727438.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/eee43020a6aa5ae05a269a19a9f4386e/vamudomafagekir.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/dukurex.pdfIn PDF document text
    • http://recrute.fr/files/files/veviv.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/04d335fb402730630a11441602e8ebc5/32081721090.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5585739437---tududugofomavewirozopanig.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/23625471929.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073853d6a67e---33059176463.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d214c514340---13772259448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=when%27s+the+next+sims+4+expansion+coming+outPDF 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_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 16880 bytes
SHA-256: c899df6a69fdc85b255627f49d4bbcf154f1550c11126e677670587d85d19d9a
font_01_sfnt_off00012d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 10980 bytes
SHA-256: 4b427970e4d76855f8c8a20fcfd29f9b6d2d2b503f305a7e8908054a74041e69

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