Malicious PDF — malware analysis report

Static analysis result for SHA-256 54328354dd8d118f…

MALICIOUS

PDF

90.9 KB Created: 2021-09-20 11:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5a7b53f160cd3c7587ba7cd89d324b5 SHA-1: 38ee8ec8ce9b65ba1ce8bed251aee7275189acd9 SHA-256: 54328354dd8d118f12a760fc986db4579943bd4f18f8d093f65d3f897631b12d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to direct users to potentially malicious or phishing sites. Heuristics indicate these links are spread across disposable hosting and compromised WordPress uploads, suggesting an attempt to obscure the true destination and leverage trusted domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=winning+eleven+2012+mod+2020 PDF link annotation
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/13125476895.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/bejosewidobobexowu.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/luzadukut.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/rasevitudobadusivexeziv.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/jn7efkk74jti26s7urbnrp1v10/42876629545.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c8d6c554---negekudima.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/44635547871.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/65405505628.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/29704246526.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/xivogaladagujes.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/vezelevab.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/22404889764.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/45809599540.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/jiraj.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141742f10e25---83781380994.pdfIn PDF document text
    • http://polipack.ru/content/file/33655529127.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/jasijubaderusani.pdfIn PDF document text
    • http://fullx.net/files/meduvusudasimi.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/71995395323.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/dolapozevolewamaruliv.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xazuk.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nakamajibuvamusuluto.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/79285337667.pdfIn PDF document text
    • 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_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 10416 bytes
SHA-256: 0fd1d41790a6409364bfea90bb744c83285410ca20fa096250a9ef51a24a4254
font_01_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 18228 bytes
SHA-256: f51bbec89a4ba1349ecd5291d435880d0fa1d4e659180837a7f4d6f268672eb8
font_02_sfnt_off00014635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1