Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd088f16e0f4ed92…

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 16:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e19174e371abfe72dbaece2c76559de SHA-1: b07aa9539f5b6f12d82cea5b35ef1832a1d06486 SHA-256: cd088f16e0f4ed920c192c8098a9ebe907aa678e8fd645675a51194cc2d1193d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=funny+school+id+pictures
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/250e5201b523fb7a542ce734fbdb7478/50734334614.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ncer5iq13rd238r9q533eg7ja7/90407576006.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8b0aae708ab0c7bd6c07d17d49050daa/81188114362.pdf
    • https://betentour.com/sites/default/files/file/tufubigeza.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609be59b8e275---61426701755.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea22d3e25f---85877329172.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/j3r5v0tdq1r5mqqc83kcg6jb2j/bageri.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4e3e2d7be8dcbfc4465a37ebc1f4e0b9/64162421545.pdf
    • https://tecnicadovolante.com/images/file/20845714157.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/50158a0654538ed5b8df8370afa5bdaa/kekapor.pdf
    • http://kleinschaden.expert/userfiles/file/66382129297.pdf
    • https://medtek.vn/storage/file/87578867514.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84b16b995---sakegulovo.pdf
    • http://douzonebnf.com/upload/file///31516544860.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607300fce4011---waxaw.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaca8d43dd---96676183883.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507110544359129.pdf
    • http://oresteruggiero.com/userfiles/files/10565256897.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4dc73b342085b03734eace4c456651f7/9827160210.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c03abe742be---ginodojotemokulorutuburaz.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328098bfd9---42287942101.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 16792 bytes
font_01_sfnt_off0000fcdb.bin
641509ca4757ecf30f502842f65763de7d48c799b9837b9b593af256a2b0da2d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 16996 bytes
font_02_sfnt_off00012945.bin
0e11d2b1801868f36292f835e85e74ea0041debebe3941af34a64ded47d0b355
pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 10640 bytes