Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a7f5b74fe3dc8…

MALICIOUS

PDF

88.9 KB Created: 2021-09-07 15:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50139b2ba9234bfeec515f442c0e8b34 SHA-1: d8caf778a604f19b1b3b4f1a74b888ca66a22ff8 SHA-256: fb1a7f5b74fe3dc8033355fa8834e21e4ecd9187b3217fff9361dab42fa25bbd
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm, likely to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drafthe.ru/uplcv?utm_term=plastic+waste+management+rules+2018+pdf PDF link annotation
    • https://globalathena.com/ckfinder/userfiles/files/ketodisaxa.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/16754200693.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/denopuxob.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/zonufuje.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2276b8ea2c---83529607334.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92e01a0bca---13304588871.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0edcab759b---kamuditapuxuzapokegitojo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zugozafafazonof.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/vedudavetopusinumakibe.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/c8sqvji4cphnunai60q28psrtm/65604309538.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/13669948103.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/40470012462.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/lojugapelijewulisa.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/pevev.pdfIn PDF document text
    • http://www.asslar.de/downloads/1564578136.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/nemobilali.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f923af56e7dcef8f61d41ca5a62c8630/92035503123.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/zanofox.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/5987455951.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a21ecbe72dd5ecbc1cc19f55413a8feb/fonibovaf.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e3c8a7bdd3df9f833d90ca460f385f41/45796167537.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_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 11532 bytes
SHA-256: 4aa6dc2f1ea2118a974170314b8ba8964c5db8d68c2af54c0e2a10ccf2d6e6dc
font_01_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 17844 bytes
SHA-256: e5705e4beba929b3205af03767c2e9893186f13301381e03342dc5495d7e4362
font_02_sfnt_off00013de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1