Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d023f30ef73da40…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 14:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cf69a0f0f7c7f4755e2b45bf07d17a9 SHA-1: 84093f211b03dce82bf5eca53a1b7e6d62885dea SHA-256: 9d023f30ef73da40b4d739bab7cb67218ef6a908393fcdd3da4da6805f210b1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=cheap+thrills+song+download+mp4 PDF link annotation
    • http://auto4-spb.ru/public/images/ckfinder/files/gogig.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109051853062242994ogs0ukmiwlj.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/barimexigebikudunigese.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/nevifodokinoguruv.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/guladolupusa.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/u344uibs3bdm6s71e896cdb6td/39057367099.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613378a955880---wawelokokofokeb.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/93876996448.pdfIn PDF document text
    • http://sushi-belovo.ru/files/16452362416.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4a10db80---73490082049.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/rugisakulomepawafu.pdfIn PDF document text
    • https://stvorki.ru/files/file/sixarugamuvudij.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/vibekufe.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/tetekapapakeramuwowef.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/luxika.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/26363445869.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/zitirimezupineli.pdfIn PDF document text
    • http://screen.by/images/file/wezag.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/gazotigisuparatok.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/0e1a0f1690583bdcdcb0a4c8b9192a33/gonelamipepopimumawemul.pdfIn PDF document text
    • http://hkalc.com/userfiles/makixalufezex.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/88181901634.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/10038368724.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/749aaded57865656b74bbbec86055066/5064629441.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e2ec3ad---tavenumiko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EE 11032 bytes
SHA-256: e738b215c4494b4811edf1f4a3203f72130540b5677e1e104c9b084619043c4f
font_02_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 15936 bytes
SHA-256: ac78c17bb420b1d4e7ad8c1d9a926c90e0e2c0d7016780ddd9e1f54738db2d5c

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