Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef03e2d1ed97498…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 05:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4eec4f39d1dc9e6862d0105286618c4e SHA-1: 53dfb5a93d064252242c9b9c6e8424ba656be0da SHA-256: cef03e2d1ed9749848ebe3011caecee9981d84c0f291e6d100dee55cb40e4932
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=departmentalization+meaning+and+bases+pdf PDF link annotation
    • http://daindnc.com/fckeditor/userfiles/file/gafap.pdfIn PDF document text
    • https://businesslife.com/content/file/77200302798.pdfIn PDF document text
    • https://tl-systems.hu/files/files/88899148809.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/27523319289.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/rifexovirubojolakok.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a597d742---zofalorotobexejog.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/55329097584.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/mosufizewumedosa.pdfIn PDF document text
    • http://test-immo.com/file/37186013952.pdfIn PDF document text
    • https://kede.org/userfiles/file/mupoziruzowavawovina.pdfIn PDF document text
    • http://greenbrier101.com/userimages/77183694633.pdfIn PDF document text
    • https://asken.as/bilder/file/migimebuwamugezigigok.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3b67lptanhjoe7h1dc2selaer1/jegezoxojopufutixodune.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/dilixisinasikal.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/69320160797.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/50800656445.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/1050502419.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/79947465761.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/75385970304.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/77762200257.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c787e1448---buroxulenu.pdfIn PDF document text
    • https://citytrafik.nu/images/file/33117826580.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/5931204696.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mecobt9peql6jgfvu6l0992gah/zudebadidekalarunuzuf.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_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 17248 bytes
SHA-256: c1cd28d489d6ab98ae7ee2e72c1afdf4cb47b5f09b03e3ccfec788afdc3bdabd
font_01_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A58 11040 bytes
SHA-256: e15b1970ecde806c23ef65a1d7d797e90e5468169f3436b4b166fff6f10ff230

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