Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7303c44a4c6974…

MALICIOUS

PDF

86.8 KB Created: 2021-08-25 19:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2bc82bfe88df976036f2dfd0c1af0479 SHA-1: f4b7d4151267d0c7d00f4f1bcbdb79a5dfe7124d SHA-256: 6b7303c44a4c6974e2ea9090c78c56e76861cce999d39446583298f711f0eea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://archism.ru/uplcv?utm_term=arcane+ascension+by+andrew+rowe PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dea9d250---12531273200.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c31c71549---13619768860.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/lejonokowiso.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c62784ea2cbd85f8aa326f446dc571ba/62265776130.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/niribikikap.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f44afd4ca76710c1586cfceb054b6ee9/tanuxewegibu.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/xijozasapukerigabizifiz.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/zalorol.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/10616570134.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210702_0BB01844A9FAC2AF.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/petarujozevurat.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa25943826---wuduluxabitabim.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/renukolusagisosiw.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/93465452446.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e870108c331da24be607d6899bf128ca/vulitemexovamu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e54b2039c55---24998890272.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/14710062637.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4db2f323---93608488820.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/10871742595.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ilag1rv7ndbgbaejjifcimldpa/94871946612.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6916c1f04d3445b54d22f6b0f057b768/fawuvepe.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/99e9a1dacfa8dfa9bef64b28334b2f34/14446705757.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/xuwirubajebar.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d864712a04b---3577288647.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/lumurexobigepodilonuji.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_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 10540 bytes
SHA-256: c846dc9a9e6c719e0e40397f0f8e645e80505871153bd7f71e7bfc96f860d8a3
font_01_sfnt_off00010589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 17620 bytes
SHA-256: 8d16aa30e40a657bed120c4a467fbb1131a191e506523fcd07b18a8179934aa9

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