Malicious PDF — malware analysis report

Static analysis result for SHA-256 e12f10135ee7ff84…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 19:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c1ce408ff4a55b9ead44a43405b3b17 SHA-1: b2315baa93ff881eced49c1b9cef643b32230fc3 SHA-256: e12f10135ee7ff84c7da4ca462def11770bcbef2c0046a4bca34846d9183f912
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://medvor.ru/uplcv?utm_term=apk+tasty+planet PDF link annotation
    • http://satthachkhe.vn/image/file/zapim.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/sujitojawidunuze.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/52949832318.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/dknvakjfkdrldmd9vea5j3gvoj/soxosufaropanotavawizoj.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/12453727301.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/43837231679.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/nabig.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/woxijiketesonarufokekefo.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/37506525812.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/jebegat.pdfIn PDF document text
    • https://nevisnews.com/userfiles/51117939554.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/waxiposudixodaxuloliz.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131310f595c6---kitumefusakomazobobudu.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/geluwux.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c6e1c00db---toxota.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/fevel.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/63865598559.pdfIn PDF document text
    • http://riviera.az/userfiles/file/930992569.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/47067922056.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/witejuwibagubemubope.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/99553102294.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/majotomu.pdfIn PDF document text
    • http://specimport.by/files/files/9081220218.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/64840169148.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/vopile.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_off0000cea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 10120 bytes
SHA-256: 5cf2e70d0db99434ab8253c1aa92cedbdb42eb23ed96e11dff159635adc3af4a
font_01_sfnt_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 17572 bytes
SHA-256: f92230680f573acf2f515a39d0b00908806ac6860e8550acbaeda3a647761b7a
font_02_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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