Malicious PDF — malware analysis report

Static analysis result for SHA-256 f709e79636ff8c51…

MALICIOUS

PDF

119.2 KB Created: 2021-09-17 14:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 51b1a99116920d2acc9c10729ba0d854 SHA-1: db96e2fa03da19c2fc128bad6a40a6304249f9b4 SHA-256: f709e79636ff8c519cf6b638f305fdddfcb9a4314fae5bc24f1e35b4909ae96d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=super+mario+2d+world+deluxe+android PDF link annotation
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jevudos.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/99791436996.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/37380368133.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/konijotukegojabofefu.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/taxugawabowaxopetazale.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/4001036465.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/28803978379.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/85468147025.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613333a5e8e77---bobawewetigonazi.pdfIn PDF document text
    • http://wohingltd.com/userfiles/dukexo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf89846946---37624106980.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/18321228552.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/dabexax.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7788232ab608efed79d3c664ae86b590/5252493037.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/80264864630.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dolevejimu.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210905_03B38C4257395650.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/152021523849.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/mawogudufam.pdfIn PDF document text
    • https://wonkingchina.com/d/files/41132291920.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/dudolamoki.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dukulukowibeti.pdfIn PDF document text
    • http://odumakus.com/uploads/files/jajafefimupofa.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/58405110002.pdfIn PDF document text
    • http://levotst.com/uploads/files/jogilem.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_off000165fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165FB 10768 bytes
SHA-256: d8d59b3c3da68dbf9de4d55c0fb722212725ee3c68e9c6584d6a6a75f24bed31
font_01_sfnt_off00017eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECA 21540 bytes
SHA-256: 15be59043c637e0ee2d6eb18f32b2614168131878fc0d017e5212d06f6bd9200
font_02_sfnt_off0001b6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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