Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c93464239052ffa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 19:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d6b35d16c2f2406a802d942a8751699 SHA-1: ffa1f06dbc3bcd2128b65a1a31bc13b24630eebf SHA-256: 5c93464239052ffae361270cf8545d9b15aea5e042295f121b9261ecd9665c8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://proartgaleria.hu/files/files/fusiraduvisofevodinasun.pdf In PDF document text
    • http://pincesorvarshop.hu/editor_up/barupemujolukexap.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/011653328092.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/lemiwopobirekusex.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/83778267464.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1face1854babf07590077621dd68415/48997184786.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zupadekiburezisetipo.pdfIn PDF document text
    • https://bor-diing.com/upload/files/sapizufaxego.pdfIn PDF document text
    • https://dhesient.com/media/80928381103.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/52259213486.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/99079028631.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/39541043129.pdfIn PDF document text
    • https://stvorki.ru/files/file/jivupurepaxoxedolevujiram.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/10364597705.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141775e0d9b2---mudasaxilekageza.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/60842237324.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/521201671.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d82825706---43776709479.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/xupevasixelami.pdfIn PDF document text
    • http://ministerium.pt/files/darogokubifutisivowed.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/31628480058.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/medosuporak.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+release+datesPDF 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_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 10220 bytes
SHA-256: 852a6a04bb98700609e063d22fd19c340ebbb404bff2a68e48e60297ef26864b
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 17804 bytes
SHA-256: 65c9e99d72d3cc0dd9b50be3549331774de5400b39e18047b5600a712ef435de
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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