Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb9c4a640ec0041…

MALICIOUS

PDF

87.7 KB Created: 2021-07-18 07:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f11bf0f589a1bbf2e9c9d65661b5574 SHA-1: e9a97160e4a84c876d8b721dc46e569d57f991ff SHA-256: ccb9c4a640ec00414ca74e8f60378d000dae3c4aed1c7ffc7e37565442704f92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links for SEO manipulation or to host malicious content. The presence of multiple URLs hosted on compromised CMS upload directories further suggests a malicious intent to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/92861690405.pdf In PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nagegivunonufupivosi.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/43dbe7721d77bdc1f3b9f0524e3a5b9d/tofal.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a060a9a73a35969cdcb745b43e48299c/35284894767.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/09orjs3m6nsvlhihkg06lo01jv/pugawilajakoz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f37c156834---91318888512.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e413d5efe1---widijaxagizerexok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095df8b3d53d---fafojipevadobugunaz.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/94070549527.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210718_E32DC7541C48D53E.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087731d42f82---sixegubotebiguxiwuzep.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/wafilozusakakiwewikijo.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/liwuda.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/regisok.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0891311b42547ef69a1466efed4b5672/vatusonodemepat.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/35062525461.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/mefelesuvuxutowoxoxaxa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/09583d7fdc5f98d6a8bda0f270513da8/69543614009.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/sbl1j8ser5a3oobmtgl36rcdf3/rixokamalerajid.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d91c8426e0d---34929325087.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/13147268540.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/fodezepalaxapu.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210605175822.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/riviwuxogojovavabir.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/sivipu.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/66817505572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+simple+video+editorPDF 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_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 16560 bytes
SHA-256: 31df1c187818eca466f228ea9ffa1721c6c735f800aee93fb209913f8121a284
font_01_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 10436 bytes
SHA-256: 9067f9847d05ea0eea46fd15e42c51fea55aa54af09c0098f31556343697dd62

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