Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e4f8f527356d5cf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 22:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea5da0b24b55fb77ca2d3d7246bd11ec SHA-1: 33209023da5f82b341d0e0ab94e3b3e19d4ce463 SHA-256: 0e4f8f527356d5cfeebe61d8bd130f90d2484b29eaa85b90d05c3f08e165fafb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. These links are designed to obscure the final destination, likely leading users to phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8881e1422---polowerifamobiwuxozivona.pdf In PDF document text
    • http://prime42.ru/userfiles/files/vorekikefetemanarefudapa.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b69c8d37---35415824484.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210606_D2AA234568882296.pdfIn PDF document text
    • http://charivne.info/images/file/kikutesutararasa.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/17624624258.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca3d5419a3---86065234236.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qso7qu6m2k56932f57vmeo8qae/46020468659.pdfIn PDF document text
    • http://sam-global.info/files/file/zuzolopokifajosopebuja.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/83ad4cad2340fe66f2754524301022b6/58264473250.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/34144353310.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/gmg9kvvbn8uk0etqpu7u67cqvm/15334925039.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160883b036ed86---ximoxumujasimaxux.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/34860552969.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/jejulufutun.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/39640410327.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/49696997154.pdfIn PDF document text
    • http://carszana.com/image/upload/File/tazopavenelenitolaru.pdfIn PDF document text
    • http://renknh.com/ckupload/files/bulafezijolejeru.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/19e6b9c161fa84d8e9feeaddf3bb8b03/35920341510.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6bb389c6---lujapesagifawoxub.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611a287f130de---74052677157.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/tizijuvusafedun.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/91549118098.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/dd64efc602a43c6ff6ead4e2a0aa7ef7/vomabavare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=movado+connect+smartwatch+instruction+manualPDF 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_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 18508 bytes
SHA-256: 8cfe293213155b60aed8ec5b75e29e7ad69822a6f09e7bca705600ee52c15005
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 10880 bytes
SHA-256: bd27ea8aff0f74c0d2d1ae3bafe5fe16012e27a46f2ee50803e0b6b5362473a9