Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c983035153a7b1…

MALICIOUS

PDF

77.7 KB Created: 2021-10-05 02:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5213109b819b50418ff85d92e598a06e SHA-1: 95c8f3fce0322999dc5426618c1638c6d9f77b7b SHA-256: 43c983035153a7b19b2d7a76ddd98f8777f0e14e4c22041a102d672b41b682d6
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on domains flagged as potentially compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the true destination or leverage trusted infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7671

Heuristics 5

  • 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
  • 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://banner-ever.com/ckImg/files/58775759233.pdf In PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nadazosanesusumulo.pdfIn PDF document text
    • http://binhthuocsau.com/hinhanh/file/89671215261.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/turifoduvitifemalogoza.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/39082283400.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134e9fce10b7---nugolunotavoziz.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/65496573267.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/90c47b1cc90bd09128f4957edfadf34c/rogogefazaz.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/liximamuwalezunawisugisaz.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/walibamipu.pdfIn PDF document text
    • https://robodom.si/files_vsebine/93794113628.pdfIn PDF document text
    • http://getem.eu/files/file/fudazokefowemudafina.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_43718ED485405764.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/suvalero.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210921021821_7ifsk2.pdfIn PDF document text
    • https://maviet.vn/upload/files/nigenubuj.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/66685280060.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161570842557a2---86406972216.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/52959598020.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/podudaxetabirob.pdfIn PDF document text
    • https://educhina.mn/editor/files/13296221454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=straight+store+layoutPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE475 18056 bytes
SHA-256: 789943fa3c9eeb8b0a96580d5783075be6def4bfea0b4dad2f90556dabfba683
font_01_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 10572 bytes
SHA-256: 9af9a6df5113ea437c963aa9dc4d07d750927125fdf3262bd7f5ca2a6fe85fb4

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