Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3eb9dbde52c3ab0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 02:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65709794eeca609a5a6e77ff55f62302 SHA-1: 2ab7f161bccf251861e8f1e528f5975b2c99b990 SHA-256: f3eb9dbde52c3ab08db437756dab4a4575851a768d9f1c0f73ab49d613ce0138
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the deceptive download button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=vertical+application+software+examples PDF link annotation
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/81053385175.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/98461049823.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/86969952578.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/wofuwexabamadiviji.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/budaf.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/nopimatupelunuxusuxibo.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/65159114702.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/tisuzinesefepanoro.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/tubakuzinojuminemonani.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/lavikeba.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1f9dbf39---58703127211.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dad38135ddc8b98b86c86d7a191eacdc/66868318306.pdfIn PDF document text
    • http://camonetinternational.com/files/file/xotorabemalugobar.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3957e098---matelejebajubuzegogop.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/rikapofutapopanetogurisop.pdfIn PDF document text
    • http://njxinbell.com/upload/files/14864233141.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zuvogiruvevitazamosasud.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/tifonejejasogadasagajejux.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd03c9de92---21810158106.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/10743494928.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/xawufoxagafujogakise.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/2422920306.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109041057199297.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/80910464861.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/votuzodirisunoxedu.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/37475282049.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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 16916 bytes
SHA-256: 9595148a6e44ec8985fab779d949d1ef5f661fb22b63872a4e76ce29a02489c2
font_01_sfnt_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 10800 bytes
SHA-256: 3770454081d9f2678a67d004bad796c377e98d3dabfd64c617601943c8ab4186
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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