Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b1e431924687fc…

MALICIOUS

PDF

92.3 KB Created: 2021-07-17 16:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77b6aeeb747389e806d616f3d2a27a04 SHA-1: 51947ca36df8da33f23580f90a32538544582e3b SHA-256: a7b1e431924687fc3f08c4d54c9b94f9d8460de254e6f13bf976b1946d9f301d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and embedded links are consistent with a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f9blb60sq4mtp2e7h7etng5542/gisarapiviwuduju.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090670782415---kadaneb.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210622175945_w5s394.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/p541r6e1meo5crhp54turkhcio/85962729048.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/51171353699.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/55803658229.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/dijikarifibarimun.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/10270451261.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/29187974270.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fepugavexurokikejefo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16088e236cfc39---83581169677.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/85373204912.pdfIn PDF document text
    • http://domainecomps.com/documents/files/gufugimogabifekupuvapas.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/lonadunef.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6c705eec---82503154400.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/64603263441.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ooouucm5svqqle5rl4ar2pg5up/xobuxiv.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vchcqv42oaumf9r0mk13lolnf4/2264657406.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/57930120642.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a314768ccb---bopugupitan.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/14359999401.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106160046005765.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/30392757732.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/wolidobufifek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=scooby+doo+and+courage+the+cowardly+dog+2021PDF 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_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 11196 bytes
SHA-256: 7c7e22f2caa059515f9ab600c34c583a66e58d3b87b6c40a446b9a47a55691bb
font_01_sfnt_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 17596 bytes
SHA-256: d440f17da179f5116f12b68ea4688d7769f82ab26a29e9f7496870ab90942c4c

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