Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a427707f22c844…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 15:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bbcbc3239c3cb95fdcee7136019a8a1 SHA-1: b16248162d37b523cc1986c17a1552d108b77368 SHA-256: d2a427707f22c8448ce01e58a4a1b88242ee86f0a165dc9d5eb61c3d928751e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external PDF files hosted on compromised websites, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ceresasrl.it/userfiles/files/18109771474.pdf In PDF document text
    • http://apsons.eu/files/file/19437389092.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/49638597930.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5893ceb3a44f83a0fb9dca387e67492c/zisasirofeb.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rqn4iu6bptnra9u8dfgl9l72sa/61111885262.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u1mub9b2tpvhj43ku12anfabd/78623293823.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/19430785513.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/gutilulapitamimab.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c21c54c1569ebff9c9d2e28368014e83/vuredejujutazunupalepe.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/045a72335428a38c3803d46a56e20874/fanatulut.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/mujadekekuxivebibuli.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/136308561061155f09274dd.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/ligizidupajonikilukefex.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/xunijazarajesujiso.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/tibisajubefaxeliwesezasuz.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078331c6d40c---54921689630.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/92185847156.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/76155808627.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161158c8c999f6---34443272443.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121d934bdf1d---negifa.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/15559594250.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/29389692548.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba15c5d7947---dubidaninitubame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reading+line+graphs+worksheets+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_off0000b7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D0 16208 bytes
SHA-256: 62eeb17ae96e71a91eeee7a0b15c1d7ef0d944ac84c248c2b163ec7a3baa58d1
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 11000 bytes
SHA-256: c0cc342f42c29d19c6572903590186c26570d842d0ed6c7e19c8b8f1a1734db9

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