Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7c87fb37ae9029…

MALICIOUS

PDF

97.9 KB Created: 2021-07-19 01:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 30989ef7962f3fb2a69e8dc26cb6737c SHA-1: 6e85bb8c11e17a6aaf20023906d5fb8b21240e4a SHA-256: bd7c87fb37ae90297fca6db11204508a3cda9adb9b4d25ff823b0308c0ef3dc7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, specifically targeting file upload directories within plugins like 'formcraft' and 'super-forms'. This suggests the document is part of a link farm or phishing campaign, likely serving as a lure to download further malicious content or redirect to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb0f5b573---88442162549.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/903730d78f767dca5c9e57ee9a2b5c72/29931183942.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7472d5a29be32d369570d6db498b6392/kexotokirim.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7f60c7ef---zisosudonaxuse.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a81fa245a63277e9269f6e906f84a2c6/8320185981.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/4044608979.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163c0e67ba---degugusebazoxiko.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/vakadaninufi.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/69201347809.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlajbh09qjdgkl1kp7mcoe6soj/zegijezom.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/40137142703.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/65258983387.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c531497f52---zepikizuzejoxefusug.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1274ec66---44191758877.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/301445286.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d4be5e6e9060eef7e1a89fb625cd9954/jusunamoxifivuxeliwo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/5310366077.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/wamorawegizepezu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c7c3305c67e7233d9b91885ce317c045/27864696167.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/61918578563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=1+timothy+questions+and+answersPDF 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_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 17384 bytes
SHA-256: 5a0826da669305eaf27ec75537682def3f89db28db37f470a861d2dbc6e37fa8
font_01_sfnt_off000147f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001600f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600F 10868 bytes
SHA-256: 77a9d0799c61354ff369accae939af46558bb96c6db2cccfd71bc8f4b6223e76