Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c4f10434b55f64…

MALICIOUS

PDF

88.4 KB Created: 2021-08-09 00:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15cdbb95a8961065b050c5c8e468f218 SHA-1: a29ee41b6bca3f651ae9604a59ecb8338d3ae9b9 SHA-256: d0c4f10434b55f64273a5d6e56fdda918b7ba2ea6cf214f973a553f370f26481
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to PDF files hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or distribute further payloads. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e8378b1d67c8ac42cf32926a58defc9/rijanapufifi.pdf In PDF document text
    • http://dzbnf.com/upload/file///79931981881.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/s5lov3cm38l7o0dmslfcm55ro7/gawowamumisabujedu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/23d106a41b48b2592994b7d55b6f1cf0/25342691638.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/65548511879.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/e799cf8b7809ae24c3452b43cc6fdf7c/gorigifavixilezupabi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c882d2a93b---fulekugopizisutixiwupibe.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/f8u5b82qhk842jced0gppfr05k/pomamil.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/novazinanawogig.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/57851d9d588d4ee80e85c6eb94bf3d54/3863961489.pdfIn PDF document text
    • https://actorconseil.com/files/file/64045689474.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021070221195525.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9617bd714e---fibasemudinupab.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/wuxagi.pdfIn PDF document text
    • http://air-con.ru/upload/files/pugedut.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/26521572451.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/vimibuxibimewiwi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609439f47d1dd---38746635116.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2f21968a---dirixibunapatadobijivowor.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ccb015c7b---rozoxosakalobovisala.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/dajopigemikojatipuwuzex.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/65149423108.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/8242865636098bc2c8310f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=forza+horizon+3+pc+free+demoPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/bowimudowirerilakaj.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_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 10780 bytes
SHA-256: 62ab223c43c765e5fea57a0235deae1bcbaa847d18249738efebb621420f4405
font_02_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 17420 bytes
SHA-256: da9b62e10ad53df0099a93c938bdb5483ef297815fecd16711a5e27fb33bcd80