Malicious PDF — malware analysis report

Static analysis result for SHA-256 829c9d8d3b918736…

MALICIOUS

PDF

78.4 KB Created: 2021-08-06 18:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef7c5c629365ad28f59e0031926c04f1 SHA-1: 16b5c7c2ff0bcc0cd9355270f47bf193d3bfb531 SHA-256: 829c9d8d3b918736d093f44a0aaaf4fffc91572872fcaef07520556bbc4c4eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://drafthe.ru/uplcv?utm_term=lil+boosie+superbad+album+zip PDF link annotation
    • https://xehowo24h.com/images/ckeditor/files/gowefurokurefazaradexadu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/97668514686.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///kibijusefosuzetemovuget.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/55657193465.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/lewufifo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082078443da2---lutopunufizum.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/jazomotijonakujago.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/30097279306.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22cf72c2ac---gabelowananomofidelemabe.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/sutigodutazakil.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vesolozirakolabo.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/18398895967.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/11930330119.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/21302236771.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/875403d68675530a091cfa6742d6d913/zifebewuduwogozezonege.pdfIn PDF document text
    • http://splogservice.ru/content/file/23833051227.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/37666071901.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3313ec7ca9f556bd41be06dd64a9ad54/29313459138.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa8fe2586---47813934535.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/81890551742.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d62731541f3---luvadurijibowazokofomunel.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/teluside.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3da4c3bdd2a7f7db757bce00cddc05e1/68158676114.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b459e7938ab---71561993839.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092d61cb87ee---foborudexawamakuwusawina.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_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 10608 bytes
SHA-256: 1a08113175af6f6b4ee3feebbc57acadde6902da06ae3de7a2d8ba649a206371
font_01_sfnt_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 16808 bytes
SHA-256: 38aa2c16628dcb16ec4bdaf15ad75c6674a9e7de9f0df4989b7f13ebd089c400

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