Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c91020ba3b0266…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 20:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d7c00ea5d396ca118afe1a376bc79f8 SHA-1: 04a90909c4e3778ec3a20c1d094367bdd15d90cf SHA-256: f3c91020ba3b02662f926b8c24e3f82dcdb4de2bfaa484293f5f5d21e2f676e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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 http://chiari-web.com/ckfinder/optimist/files/lefopijotamizetosidisesus.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140be39e6fed---vunegek.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fovisewekiwigilarevu.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/28115802753.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/zulabalatepexewuvi.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/88083677248.pdfIn PDF document text
    • https://kuepancong.com/contents/files/93895789105.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/megiwemizuxovew.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210902_023C3118E367D7E5.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/17026789482.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141163a23236---59715085485.pdfIn PDF document text
    • https://emenu.hu/editor_up/53211692157.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8bef34b8e73624de37ffbb91c50473f2/93900606565.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d8dbdafa5bb211d80dc1cc709fab126a/25944894650.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161420acf7b7c0---14018023246.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/wunajeb.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/monuj.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/named.pdfIn PDF document text
    • http://anitt.in/ckfinder/userfiles/files/kisukawokapexaki.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ne9vlm2h00lrmoopsu3d84eecf/wuvebokotozodeviremuvoxi.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/sumileromiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+komiku+appPDF link annotation
    • 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_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 18264 bytes
SHA-256: dbd5c35705109a0d8c21c5d05934dbed55c472d7d9308e03f909b4999c7b99b8
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10336 bytes
SHA-256: bc4125820cb7188920eb5b4d9536c25deeb34104cfaf8732c3a8ba1a2630a5fd
font_02_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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