Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ba34dbb9e190a8…

MALICIOUS

PDF

111.6 KB Created: 2021-06-26 00:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 891100c8788a022d74c1e0e35da8df82 SHA-1: 24eea5b13f4955598117d822c686c9502589c92f SHA-256: f4ba34dbb9e190a80c72eed68bcb057df7112b0ac24f8d2511ca3dd2fdcaae92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it is part of a link farm hosted on compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hitourkorea.com/FileData/ckfinder/files/20210608_3996222F5EBF5D76.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf828c3ecd---1402904227.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b92c593bd9---lujutoj.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/tevefenapitozetivuwepam.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a87bba73---zexelokobozavebijazeta.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/c125784e95fd94292fce7a52120a8ed0/wosovitotiwutunogedadimu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/48f74gl212ielq9kfptjvcca3o/15354848909.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/f4a59562c5b1390d90fc6ab48cb7a238/54896090339.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/90736666730.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94ac781e7---wagewisorovetul.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0aca68f31---55494329611.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gokemogegewodataketirop.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/45e01a3fb3caa61248e6bd401f0d76f3/jewefifekiwewamisip.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/8j0r8ag08jn9a33q3kokdvajc0/xinidumoxerofan.pdfIn PDF document text
    • http://byecook.com/ckupload/files/93545656884.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16095fdea5ed2d---lonagepexewisejima.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb86e32a6---pufikivowezugilofolaneki.pdfIn PDF document text
    • http://kotolantopeni.cz/file/rivemegiwetanafadev.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/bamawafavupixomowukunun.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/dc79c54d19e19a91856e09aa99750dca/mabavizeguxaxanopupu.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b940d9258ddbaa44e8e1fdce8f2e9713/bojokujoket.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafcb5f365---52585425649.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8c75d2e13756bfbd27c28ce5f25e76e8/51700666353.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/54947667508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=classical+liberalism+and+libertarianismPDF 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_off0001549a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAC 17148 bytes
SHA-256: bea7f8d5fe5f92b98c1b5c2ee1bd4332c07e20392463a13bb09f80a6869ed392
font_02_sfnt_off00019901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19901 10580 bytes
SHA-256: 71b630b7645d6845ee5c323695dc129f7808d97d9702bd29ada7fc0a494665a3

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