Malicious PDF — malware analysis report

Static analysis result for SHA-256 8433b6f22ca6ee09…

MALICIOUS

PDF

86.8 KB Created: 2021-10-13 18:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4fdc21bc455c64dee5c6d8013d96856 SHA-1: 2f47ddf1b7aa6d7aa8116b2024d3f23e7684be6c SHA-256: 8433b6f22ca6ee093b094554b976667ae515ae94c448ffcd1eaaab8733a9a970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://drafthe.ru/uplcv?utm_term=the+new+adventures+of+winnie+the+pooh+paw+and+order PDF link annotation
    • http://budka39.ru/files/98378612046.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/46035367474.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/91340628872.pdfIn PDF document text
    • http://kechengchem.com/upload/files/65588124073.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202110121959273881.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/14834813041.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/woporiwikidiwunof.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/nufukuzitulafolabuf.pdfIn PDF document text
    • http://agilesolutions.in/uploads/19702000681.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/gotuwibekikevo.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/totuxesilesetomodewine.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/90e14f7da728506e316ce208d5d02c0a/tisuzoxinuzu.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/28898251118.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d1402064---32415348252.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/471f345d57d79bc18d84e5329e8dafa1/temozevixafefapisidige.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/12353224058.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/87322024978.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/famusolifotekejosevamoke.pdfIn PDF document text
    • https://reha.bg/content/upload/file/palezajamiwaj.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/jejidadaritaredadi.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/famunonaxej.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/44489690367.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/500891422.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16160d0743b5dd---xonipote.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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 19560 bytes
SHA-256: 4d4c45bba0cde2731a9bb4bc637ee09fc175b4d70e7f2e738fc222a1ed748b35
font_01_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A0 10764 bytes
SHA-256: 800a664897cea8c51842a4fe46ed11436c09de725d26747881b72e6a0e03b625

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