Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ce91948a32dc07…

MALICIOUS

PDF

71.7 KB Created: 2021-10-03 10:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dd096aa1583ba7cc4c654a99a2026433 SHA-1: e64a54ee00422f9118dfde8c03b872af55d3b811 SHA-256: 99ce91948a32dc071025a0250c6fde43a43e73aebfbcf6c6c547b751a83c8c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and heuristic firings point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.ondebiz.com/userfiles/file/xumatod.pdf In PDF document text
    • http://pension-erlkoenig.de/img/editor/file/torisexoxogojowewoniji.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/fojefovuvatifizitup.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9de815e5cc5aa94e209cc723f4ee4134/gixilojadatizaxivezude.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/5302803490.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158eab2ef31c---84462115132.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/keperaxuxukixoraku.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/pazovenaw.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/51709527527.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/watofolipabab.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/guted.pdfIn PDF document text
    • http://bibikid.ru/upload/71497148709.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/bexotiwezaloz.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/ravozosatofuxifalese.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b92d078c9c6578fbfcf877a913c6833d/61141101609.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/pofazeponarum.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/97716426656.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/mosoxopapovel.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/lugapekuberuri.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/bifazadowedugifolaguna.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/gavevuxudi.pdfIn PDF document text
    • http://rubensova16.cz/files/file/45854567031.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/956d38bffe069ac1f596630dda00e362/vawuxunilagadutolejo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615694d4ccbf7---39510545577.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/liweki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=truly+asian+dating+apk+downloadPDF 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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 10792 bytes
SHA-256: bdd752cddea945088a7a20c370655e919193bfec940f0cb67a4cf65380a1752b
font_01_sfnt_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 17016 bytes
SHA-256: 9e2c1db54d77b188fb3979e05e7558f9d74e346515d5d193eeb487387fce45fc
font_02_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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