Malicious PDF — malware analysis report

Static analysis result for SHA-256 3379702721418de7…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 09:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 1ccf0ac919b51ef92ccea071b2aa1b9f SHA-1: 1cc2f03f6b1f90462afc66246ec4265254918a24 SHA-256: 3379702721418de7659201fe44bcb7f2d95d0ef47d387b49601c2fff6b11e4c5
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 features a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • 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://webhosting4.net/media/file/62606818812.pdf In PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/pomima.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/67031840956.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/tadefada.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee5550412---45335471860.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/97767765126.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/2425230418.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/60444742011.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/medidumovuzasovav.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/32cd4a00e4afea69af490daeffd392f2/suxamuzivanuxorev.pdfIn PDF document text
    • http://tavio.su/files/file/1192521162.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/351d6d59ccd3eab9d46a3d48d300f118/59982936239.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbf6e8ce37031816bb5b891a1101c367/65772304627.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/notavibuxojexejubefa.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/59192561628.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/38821214484.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/10971287044.pdfIn PDF document text
    • https://dalba.net/other_files/File/rabefimizelepomikot.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/08931e10cf2fcf4cb8f696ca424ad704/78499943584.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca5a4ecb99---jinar.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/sufebisinen.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/63345184735.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/wudufagejobatezo.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/21268768773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=matter+substances+vs+mixtures+worksheet+answers+keyPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3369df96fe7b198b7c88ca448f7a3012/nirufa.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cd29.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCD29 18136 bytes
SHA-256: 7d8bab67b04b54fcff6cfa747c7dd0f77e72d1c9d94a3be8453034e609950764
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 17432 bytes
SHA-256: f6091898d447144ecfd41e47509f7e72bb93913be136dcaecf19cf2b7bde1d8e
font_02_sfnt_off0001171e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F35 11140 bytes
SHA-256: 066aa244e83c2c246c0d517c6d49f97ceb08ee36c4e80b5bafe2dcafce2c0a3d

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