Malicious PDF — malware analysis report

Static analysis result for SHA-256 504049e6d951611f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 20:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a48b735e82b097283145b69b01444e0 SHA-1: 657c8d2203ed82eec511dbdea941470129f44849 SHA-256: 504049e6d951611f4074f195624110722202feed8c1257669ac66e2ba8fa0c85
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ubytovna-krumlov.cz/userfiles/file/13002301006.pdf In PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/75113397515.pdfIn PDF document text
    • http://allycatering.com/userfiles/75092428184.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160841ceac4947---25182839236.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/29901270798.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3136535da---97443241109.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/vogovofefowezigebub.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fefd1d92cd---kaxisoxodadegokobipakat.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc8cb66a0---zojutigirep.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/nusisejagoliweted.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9144797b37---jogisoruk.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/eb7633e3db57d25491144e3d3c7acfc5/33462124435.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1110a53c587dfa752800224bdb347111/17855066187.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a3302ec94a04e5e9a1742edb54437974/35535597840.pdfIn PDF document text
    • http://mayjack.com/upload/files/makilagiturutuguluj.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/vuxiforuwewuser.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/julorotuwejevapajuruxa.pdfIn PDF document text
    • http://westmont1970.com/clients/1/1d/1d0046bffbd1a03ca32bb02538d2ceaa/File/47520468616.pdfIn PDF document text
    • https://estoniapools.com/contents//files/relakoxeraronoxaralesore.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/wizuwaxudemo.pdfIn PDF document text
    • http://santeh.md/img/files/wapaseboli.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/73477803836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=collins+english+french+dictionary+pdfPDF 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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 11044 bytes
SHA-256: b89bbe8481907f06f8487bbb442686e3ccdacbeaad738f53edf6e7c153d44341
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 20540 bytes
SHA-256: bff632975ebbb3fd495eab95853507e65e51dff547eaee458930221066760c73
font_02_sfnt_off00013171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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