Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d1ff9afadcee69…

MALICIOUS

PDF

103.3 KB Created: 2021-07-15 10:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 579ca1dc99c75e5828d3b3f9585f3cde SHA-1: 19427eaeb7cbd3e7e32cf7240e43c5c2f29b399b SHA-256: c6d1ff9afadcee6990c9311a679faddfbdf8c857a5f364ef6312ad3454bdd0f2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The embedded URLs, many hosted on disposable domains or compromised sites, are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/44ceea7567027cdc4ae6fe2297542cf2/90168764186.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4pmudqmj6id7ak2v7telq9e4j6/favek.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/87627564856.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8eac70aac---95969865675.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074dafec2720---bogesafilo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160dde5cf521ff---vudakijamadukexuvakeri.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b6c744d1798a775d8c24b47255bfa545/nivazikun.pdfIn PDF document text
    • https://anfauglir.com/images/file/munur.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7f2dfb369e471dcca458d215cd770910/nosemuwelijovulesi.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/figunipezam.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160efdeb6771fe---55255040103.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/025c03737bead58688e2940fb12aeb5b/wusasafudosexezumadozaju.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160805c1ae17f8---28386367701.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/613a5cfb288f0dcf3a8fd99529ed354a/femuwosutiworaxot.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b12371a009e44df86db65808bf8b9f12/bikitagutukulewedabeb.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/82913614316.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/28763787527.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda44040d9---kizidudilatimumeniweko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a291e8a406---vujukudabalidojit.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/vifukisowokinof.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/24130690346.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f1d50cdd---pobegafibogusi.pdfIn PDF document text
    • http://brlairport.com/images/file/zofetariladekim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=annals+of+dental+specialityPDF 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_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 17352 bytes
SHA-256: f65cc32e5302e2885051dd030636d85775dbd54f7d08a4ee292cef95bf6d1a37
font_01_sfnt_off00015f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17774 10608 bytes
SHA-256: c30500493ce439cda7a1ea3031851257e974f075d4a3e8972b1b7e257f80d415

Open this report in the interactive analyzer, or submit your own file for analysis.