Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0c4d3480d569ff…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 07:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8a6879b24f9f220c66489663cb578f3 SHA-1: a723236e645f7ec1ea02ebb2364bbd30539c6aca SHA-256: ff0c4d3480d569ff964dc5aae0b27293163236ce247c38362838b81de4d31ce7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, but the structure suggests a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://livresdarts.com/ckfinder/userfiles/files/milisaketebeberojuwapo.pdf In PDF document text
    • http://paillasse.hu/userfiles/file/dokogosewemufozo.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/xuzemokesavazabesamis.pdfIn PDF document text
    • https://poker-fire.de/file/76457606733.pdfIn PDF document text
    • http://goref.ru/files/file/27507133835.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/bokewofob.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/61425917649.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/17872699187.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/gojegowog.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/27690886226.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0f90435b---37453030675.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/538df65106fca2ebd0c5e3f9e5210f98/rikobulupitag.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/4d0a63c4b359111fa4889c3380e46e13/29183379631.pdfIn PDF document text
    • https://suksesunited.com/contents//files/nobemikuwipukozunu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8d485320548a6a7e49849ccfdafe2c9c/12011031503.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4464093671---xisexusibafozetexerak.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/64b56mmihk2t1k8bsg9iafq06o/2562910013.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611320f56a502---mapidevafa.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/33802766999.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da8ea71f16b---melagaronikudovinasow.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b591d568640---57117490854.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ol2or71bquiu3ip0un5kjha295/19517845738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=prisms+geometry+worksheetPDF 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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10536 bytes
SHA-256: 5bd6869d43c27154db979ccc53f852037d14340aeeaf7eb020fc18930e5b8973
font_02_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 16004 bytes
SHA-256: b5aa50a489e640f697980f3744355c87217405ae11089ccb67afc22c2960a452

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