Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ade3661a99cd2a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 03:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0128d58527d6af2e6901d24be1ac6ccd SHA-1: 67e0bda4ff8aa22d3181891d8b61abb890da7985 SHA-256: 54ade3661a99cd2a3de3fa9226603af858b08514d3e4b97742b2b90385ef7488
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=interpersonal+process+in+therapy+pdf PDF link annotation
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/damalafamonaj.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/boxufifuxuwukiluk.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05667032d---wokuxixipusizedixinimoze.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/nefesawolanuxuvabije.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/modoferepegogif.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/47684209314.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4606ef84f---75947982252.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/dewunizetabow.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/1455378454.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/jevot.pdfIn PDF document text
    • http://afro-safari.com/upload/files/33471008647.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78683568963.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6eefbe8155edc7c3199cf8d5b33d1733/modamekikajixa.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/19768461174.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/kutexa.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/fujabinofenijuzusoxulesuw.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210914121157.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/rememetupotimazomeniti.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/zisibagazaxusa.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/dawera.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/gubefubozijalubogurabuka.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b9feeedf472bab6555c30f28a932d96a/wawinurojibax.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/3030727475.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/64857589740.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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16872 bytes
SHA-256: 74ce723f3ca50bd3e7eeff1d51d72eab48e2b67ee5dd8c0f023c1c2ebe6e1094
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 10784 bytes
SHA-256: b35da548e0305cc7bbaec0677b97f9ad059ebef184c15d733d4f5660bebe9bad
font_02_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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