Malicious PDF — malware analysis report

Static analysis result for SHA-256 337bef6805510f87…

MALICIOUS

PDF

89.0 KB Created: 2021-09-17 08:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 969e16c56b4929b51cd4b750a5e85024 SHA-1: fe880a7b9ff10fef3cf1237c15cdab553af344ac SHA-256: 337bef6805510f87763f81e7d57f4ceccc3abdec186b501fd7bfe1c530474620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://bandotrading.it/uploads/file/84859696240.pdf In PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/ruxedax.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qr7qfb8cq5tlqcfdlso3eavnl4/delunuvixo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c29fe5eb0---4797347450.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/cea3a1059adad9669e88d44e1f5b8131/65546690119.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e2a18cf55e676cc253ff3ca97c2d77c8/dupebub.pdfIn PDF document text
    • https://profesa.net/userFilesfile/32264809464.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31cd0e336---sovojomuriweze.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404c77afa3c---74071976348.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/wemerixobosefilesogap.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440b7de3773---86535965388.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/pufuvajunoluwidoza.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/27389810633.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/kodiwulalodakozimu.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108311748088028.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/98717798297.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/10f7758692f42b843decbf7d79ccc0c1/19730886556.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a5ad39b7d9fbd85555dc71366dce4e45/87869903254.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/32265055277.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/bovifedezaba.pdfIn PDF document text
    • http://szm.hu/userfiles/file/sawovutizujaxog.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/62263498780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=use+pc+internet+on+android+via+bluetoothPDF 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_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10924 bytes
SHA-256: 46ba6a749cf128aef044f55812ec36b2ae4fb4df4578e8d06430772019d8e0b0
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 18332 bytes
SHA-256: c7d485982803de65dd582c40d5bbdb043fea5d32d60248c96f15eb9fee565518
font_02_sfnt_off00013e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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