Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1876a684e4432…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 07:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f76015eb2fdfa376e9690b9bfcaf73a SHA-1: 719f51b7e435fd4c4b329564a0f02296d88166a8 SHA-256: 42c1876a684e443249046e114120312dd30ef8055ad316268837532c54a233ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload directories and other unknown hosts, suggesting it's used to distribute further malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3eae8ae7---92913084013.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9d01c3447eb714beb4b1b336a78005f2/81856146996.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/8495756477.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/ruluropagala.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/63040396689.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/66966853108.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/51801169172.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/91764534111.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d7d88e3bf---53559561921.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec935b8a7---pabikukivijoluwizitofop.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/madufebixabeluvupa.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5a0i6mvr7gbbmtvfk9vp98f67o/36142654844.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kg740e8rf10tnj21i0talrkhk0/ravaxawiwavedus.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/16968924914.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/77454281342.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/tidizajefileduje.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160771d7c9cd85---rudufek.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/mizekaxizulixedupotofelum.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7e51c30603bfb063bc52baf9efb1cc29/65869047505.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/irn3bmt6b4jtnj8qk3gpetp4mo/61497739994.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/44659975199.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/83212375437.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160707da29ed16---dukananofawabefebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sports+gk+questionsPDF 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_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10632 bytes
SHA-256: fe0d023adac2515598982550b47308c50f12b8075600f954290df48a87ed1d8e
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 17088 bytes
SHA-256: af39ad6f9092b3ff82959a179db447575169a31f8f1e7d5bd8947f3c88249943

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