Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e51fb8d49444a0…

MALICIOUS

PDF

93.8 KB Created: 2021-08-09 20:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a89401d57f16179b2a4a6cca59d92cbf SHA-1: 2c2d61c5a595e85ca296515b4cd276324d7e72f0 SHA-256: f7e51fb8d49444a03979982b2ba28eec6a86db9d69471c9f34cd8037ba8ca427
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. The file's structure and link distribution suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://amoy-art.com/Upload/file/dubuluko.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7vusmrcj92eu1lu2hk4bgke8t5/10628749582.pdfIn PDF document text
    • http://446888.top/userfiles/file/wedukowedasedopejam.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/sigagenebijizebuveniwufu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/30399d1c0342b742269059b40ad82321/pokogevenusaj.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0d7ad74898c7ad5910c5e19d68b79dff/viriluwegudutomelajo.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/29351795659.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/58414274904.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd98f664446---9247851345.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d1a4d86c---76108150969.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/idj50vf6e1srh4gme9lodjq7sp/37491460842.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/36855435992.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/5491870130.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/nerosifibuzaxibuwazun.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/pafukuxe.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807d19250d4---zanopukeze.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/bulugiwupatirisowububevu.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/49576913739.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/89401267009.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/aa72ae7cfbe98a8ea0169189a22fd24e/77175673067.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610080c2f239a---jupara.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/tezejinexizerapowo.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9e2cf42a2bd294f5860975bb3529c73a/28205073738.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/vajoluzekokolevulapowokin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=teoria+del+comportamiento+humano+administracion+pdfPDF 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_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 10948 bytes
SHA-256: 25fdd359c860e7abd2ff26f208aea6fb3fadfc88b712d8800a26ee4cf52649a5
font_01_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 18236 bytes
SHA-256: 81ed1bf145fd446225e4360d36d028dee2108b843376644090abdfa752026165