Malicious PDF — malware analysis report

Static analysis result for SHA-256 05198fc3470b7ca8…

MALICIOUS

PDF

84.9 KB Created: 2021-08-08 05:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5f3e6c9c69fcc89a9c2f350bba9a5157 SHA-1: 1666ec5a898984349078bc11a73fb0d8f8c2c49b SHA-256: 05198fc3470b7ca8f8edd8f4ced5200c991f410495aecbf130f293d2cf5af459
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2780k0bcqqk1cf3otnlqss117q/tuwujujavigozerego.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16082e965460fb---vaxusaw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/955e77a84e213f4ae55dfaf0bbcb6f1f/vizagiponidemokigebavomoj.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/salujav.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ab64dfc0a---liburiromodifuwig.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948482a0a7d---67250428926.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/47887924794.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83c078504---wawesobudajujikixuw.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/niseliwoxalevivosijegelom.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/rixubaserimirivolidapo.pdfIn PDF document text
    • http://wohingltd.com/userfiles/bopetumu.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/88922418843.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/bozekifumugojumavojonozu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u9at3n84i77c3j0326m9ti7foa/67366920769.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/losudibikejitop.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/25788435246.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/69506976365.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/sidurubodafatopux.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/53991339734.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/gudixawavuk.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/wudekosudejelajizajikerej.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b0518d5b4ce---lupubetusevazomizatabowa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffe60c911---8312113092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+crucible+act+4+summary+quizPDF 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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16444 bytes
SHA-256: 11d6b8de80dc4f152a5b5542f1e9e79b96d9cc95578b61721b56d8bce6d32f0d
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 10872 bytes
SHA-256: de8236bfb806d8ce00da5b0d17369a2d048918486e568154b5d5ba4a61ffb9d8
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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