Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc013f2894c5f122…

MALICIOUS

PDF

181.6 KB Created: 2021-06-12 13:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0a977f1a8b859e844874605eb8421310 SHA-1: 72b58842355828d8d4d0411026e1b06e835236af SHA-256: bc013f2894c5f1224884401746376a5a4406bcd382c82736a18bd3933e773efc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8620

Heuristics 4

  • 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
  • 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://coretry.ru/uplcv?utm_term=stardew+valley+realistic+portraits PDF link annotation
    • https://binarbaidservices.com/public_html/userfiles/file/wisalus.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/275743bf178e4c703bac7b0a3c83dc5b/4339380106.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/02b053f0b15d30d1994fb574d49d2469/23111649380.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/vasuxitifogaki.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c22d7dce060---gigirux.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/859713951dee19052ee6d745d245f9c7/lumaxi.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jiwoneta.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d29312b1f0444197a402037e4b013d6d/1557507974.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/1ca80dafd080ff50d583bc860f1505f6/21274673430.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3cc07dccb---goxodivanuwazogudamulek.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/zogokivevunixitiwezaruku.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4f8920a2fb302ff199616c4cf6f5d451/64540006468.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gljgvaeft89ibmrsk5e2ah5jg7/60357935119.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/21038397347.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/nejegijepulufagesuvuju.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501225007390220.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jozosita.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/dasilapariloxasopazejipoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002963f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2963F 5424 bytes
SHA-256: 61d80ecfd30b1bf9efb3bcdc6a9a7a34b69ee8f93f827c25e960022864929ef7
font_01_sfnt_off0002a8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A8D6 2164 bytes
SHA-256: 004fb24e3bc8720c0e2fdfcb133e2cbbfad8b01beb3d558a128908054a25740c
font_02_sfnt_off0002b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2A2 11928 bytes
SHA-256: cfeaf3f6f53d76d2d28b5fe4fde9eb3177d61f57c6830ab69a1a395c0ace05ab

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