Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c1e33879cc9b8e…

MALICIOUS

PDF

86.1 KB Created: 2021-08-02 15:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17cd0e194743474a37c577a31953c171 SHA-1: 9bc6ca85502bc10f19629c67f8e765996146c7a8 SHA-256: 43c1e33879cc9b8e66a44fe3c379d14a5b3259e2f2ef0901a1beae3020bdca86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress uploads or disposable domains, suggesting a link farm designed to lead users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=what+are+the+pros+and+cons+of+using+geothermal+energy PDF link annotation
    • https://steammining.com/userfiles/file/83754817038.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f01f49ffa---fejoviwefoboxagatuzil.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wejevet.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941de56f85c---417160014.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/52476237275.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/22d5bddae8675e3ac48c8c08ee0ec822/xebanifa.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/wododiwalufelufuwixogov.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/gutemagirepow.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/turutesarul.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb3e269315358bb847853f63f2fa8a94/disolesojogewebo.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/27376097946.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/dazivo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ceb736a---61324034577.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/95205617345.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b60854864---didudidapata.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/94001865406.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9719a9fd6c4cbf97e94145c9ea09a9fb/5765874675.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969a1b15f0b---42586590512.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c946c48ab2---60401528012.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1089a783---buwivig.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/denavab.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e860fbed5f---79995660053.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/93d152abd48a6059781e9596a1e7ae4f/xosiduwonusetewisisud.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/57173225951.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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 11272 bytes
SHA-256: c97edba2386fa71d3640c983183eef6e030b2fba5fbb1b5949ab41eba25009c9
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16496 bytes
SHA-256: af3992927ac9d84369f3797e8e9e53f47838c4030880dc6d7038ed62ec36f706
font_02_sfnt_off000131ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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