Malicious PDF — malware analysis report

Static analysis result for SHA-256 197b27099fb5fecb…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 12:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47a74762b8e696c8e5fef7d6e2b8232e SHA-1: b51df4dc87b226c5e852417f5bf64e11a9ca70f8 SHA-256: 197b27099fb5fecb7d49c2b1d3d580f546c3aed06b6634357ef00ef66c958e64
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to external URLs for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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://garglob.ru/uplcv?utm_term=how+big+is+a+sonic+mini+blast PDF link annotation
    • http://clevio.biz/fckUpload/file/22584530343.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/978f1263e0c70e2dfa4bd70cb9cc3ab9/jojujanorukosidiguviso.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zanavunalox.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c133a0c6b83---6338868615.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f0f8d2e1f9b424621282a8514d7673df/koxedawebupoxa.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/sjmvvffkg461qj9gjmk8p1fmp1/zemutofomuji.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/kirebogekojesebu.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/2162018696.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/84205741815.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/2117781980.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t1ihga7odcurmbk6sf52v9qb16/95448967236.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/04b6c6ab7abfecc0c50c0b01006fe34b/baxereremevo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/fc88b40e6309bd7a7210d80d892e8cbc/kunozumi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tdq3m6doiak6p344n8s5tol1ba/72046610881.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/gumuvatos.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/13364408054.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/sorakibapukidogevawupi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/74b2de7b6030f10187920c2c26072636/zavajoxir.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/14/94232844027.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160de2166d3a67---gapukusawokeg.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/83198002337.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gijj7flhthk6n4o0do9d2frpum/2491769027.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/37208d286baacc43e2b149d9fa3aa763/51659030550.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/84353226476.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/wovezaso.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/mpffil4g9qse7620hupulftco3/41518303517.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://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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 17496 bytes
SHA-256: 21cb778229bef2a4bcda6d840b9448aebdb6eeace94dfb6b8a32d531229bb283
font_01_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 10556 bytes
SHA-256: eacc3a5a69807974c9e54a4f4d7e9798c27fb88da57f8c1ca35bea9ab41224c4