Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51e72459ed68b09…

MALICIOUS

PDF

80.9 KB Created: 2021-08-23 14:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16013c7f0487e0a4edf5f153c15cb960 SHA-1: ebbe7346406271032c8e49f6b713c66d8c80a188 SHA-256: c51e72459ed68b0972c362401b9194dd72ecd03ab3f4b6048a2f4f5c69124615
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute a password-protected archive. The presence of embedded URLs and the overall structure indicate a phishing campaign designed to trick users into downloading a concealed payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=how+to+convert+pdf+to+zip+file+on+windows+10 PDF link annotation
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e13b75475---lavatowivumakusofoveke.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/41901394763.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/25284bde779e49b955590e81686e1f1d/15015073307.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/19996958292.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/24522083054.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/zatekexud.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160804945b0cbc---fofimafesuravos.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/rewubefa.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ngtt3huvqkvi35vklp06i9bf8v/11330668352.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f80b79889---weduzujoxe.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210630_0929A7816606532B.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/bubebomotenuxavukakovubu.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/78805779700.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/99935144053.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/rchddover2fs71upjpcse6qqc2/1790406862.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaf7a7cb3---10123929544.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cp5rnpo2ea09iqqedneuoi4u91/delofumozetanesivutet.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/66768c7f9515de787ec75b4fb97928de/duwijazerege.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/luzuwurebamanizolijeta.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93f96c8c4---97403452024.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1610509fe241bb---vinadi.pdfIn PDF document text
    • 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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 10828 bytes
SHA-256: 33f8efd65077db1e85f387128ea6f8981d2a4200704157d5299395ca8e6205a8
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16728 bytes
SHA-256: 6df7217f894ff2bcd63dd0173822e153bd58f3ac1e2d16e55879cdf0955aebdb
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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