Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceeda375e5c4bfae…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 20:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd136bdd764f96e3418d0f245b785131 SHA-1: 6179cf8da61310a7255be1e1b04322f43bc9043b SHA-256: ceeda375e5c4bfaee5e59e23281997926454f904a12d87f2f607fd1286d85af2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and link farm patterns, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL patterns and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gazeta-msp.pl/user_files/File/42719105876.pdf In PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/pudemuvo.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/6096500982.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/mepibepuzor.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/tobegagobituriwifowi.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-11/images/files/jumiwexerasuxalo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2e3ab06bfc4ac80be5f2943bc73ce76c/zitimagasuge.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/64909680609.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xetobezuripuf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161381e05c77fd---41180173101.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pobonidesilekepuburomu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/gnpjbvk5bad5jb7fvorhrhth5h/jirusefafosojikuxazo.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/51786744200.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8c1c3ee9---73325936548.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/xopipatelinakewemoka.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/11144015360.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5acbf1a96---nuvirifipiletid.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/poguxapotugenavuketoxe.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/tinomekotunepupatoveki.pdfIn PDF document text
    • https://bor-diing.com/upload/files/79546209663.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1eedcc9a7---42295214572.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613447b08c83a---jazizawokowan.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/nutamamupiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tubemate+video+converterPDF 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_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 18392 bytes
SHA-256: 59fec9a1cdcabf75123607098b45dca3a333509f402f30bab1cd0c70c5e2ad29
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 10588 bytes
SHA-256: bdb21afd90155cafdc21a41e4406a058c500bf865131f147285e9d907b2aa9fd

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