Malicious PDF — malware analysis report

Static analysis result for SHA-256 358d38bdaf053b00…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 10:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 31c6027f111e28731d723cdd1cc4374b SHA-1: 14b9238ee54ff35740ac4abc11fff9b7b80bafd4 SHA-256: 358d38bdaf053b00b56d3cb122b62fcfe359525066ab99b3c417eadafd76366e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://coretry.ru/uplcv?utm_term=dover+beach+poem+analysis PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2e7c1229b---mavubanibasama.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/90579484315.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35934633181.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/sokamitin.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/nerebovanipub.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dilakor.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a444b78e4---49786269167.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631471294.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/nones.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/88447662397.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6534b355---fazunakefifekuxowu.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/tixamuzolivola.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/safek.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/81125090597.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139684681f48---45945886202.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/31863700549.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/tejexerufike.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/55778498429.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401e20502d9---zudativogabodaj.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/27123514086.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/71116643751.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/gogatomilufajopa.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/mijuturoxit.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/gesesifajov.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/60254040428.pdfIn PDF document text
    • http://asid.rw/userfiles/file/84987337792.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/41160524145.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_off0000bbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 15724 bytes
SHA-256: ecc5c95a77b92d972026c12ba94f7270760d7a102c226032a5ad516ddc4ec3e0
font_02_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 10864 bytes
SHA-256: 47d9c0a8f431496ff0454023bbdc729cd025170ad47bfa1ecb6d84c6b5513b57