Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdbbe9782fd09f8…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 01:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4982dc18fb795211c243404cf9a89d3b SHA-1: 3b7d1a000df41b5b79b9f44e64834f13b1be0bd4 SHA-256: fcdbbe9782fd09f8ce33589cfbfa587baea75fc6fe94ce2ab3958a38a7fcb487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites, likely intended to redirect users to phishing pages or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple distinct hosts hosting PDF files strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa256a079c1---7532838414.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v8c1na79fq8rojq8lmik51gcti/18666536402.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/23121928982.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/11b43c04c7c3a8ff4b1ed86dbdccbb0b/83249355173.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/51912232580.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/vediru.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/gebukurefoves.pdfIn PDF document text
    • https://ferropula.hr/files/fevarolugorudosef.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5erthdl7dc5ijo9v6bahu3cgn7/tonezuvuzav.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/3ghh8hp58ftu3rf2ncioh7jaks/wizatidilitilez.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/20561962396.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/53868022670.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb3c2b3f7---60051013942.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095718c6e278---27488016420.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/67a2e8690d5f978b47a056ebf98358b4/26421512241.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/nexamojoropawili.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xebejadakatizof.pdfIn PDF document text
    • https://avenue102.com/uploads/file/tewurebafasizawuta.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/60466605961.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/morovoru.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c1f9cd29833d8cf82d186563470ba58a/59946039083.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082613dcb917---kefivusabaxajaze.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160783bc093764---mejovoxin.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160705a66a00e6---nimuxovenomixis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=painting+with+janePDF 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_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 16936 bytes
SHA-256: e4fc3e6854d43e91f9d26a232fe54a606f8bea01144ecccd3d8061aed0e2f83c
font_01_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 10172 bytes
SHA-256: ef472117ace406e8ba83ad36ddedf2cb841586d954d85a7cd7c47cc7254aae3a