Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dff1c74c1e03a9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-03 03:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ede086840ee16f53eca1ae6280d2cc62 SHA-1: 8665f80879da09f87da54094bf36accc2632541a SHA-256: 20dff1c74c1e03a9cc97676240a220b24737445f414cb1fa5ebf3512be1da8d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the PDF is designed to host a link farm, potentially for SEO manipulation or to serve as a distribution point for further malicious content. The presence of multiple external URIs and link farm indicators points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=college+textbook+pdf+library PDF link annotation
    • https://ikincielinmak.com/upload/ckfinder/files/foresiw.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/51024330910.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8db52a3f1---64872570828.pdfIn PDF document text
    • http://vejwun.cz/images/94867871718.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/kovago.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49cec7d593---fikevesufevoguvuzutefi.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/renugowijela.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/mixajivejasatatulinato.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070613372383.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/zubibanepisofi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69dc6f303---raraxazem.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/numagaxetodakiluvama.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/vawixenisonas.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3743957daa410a39dc6ed9d67e4ccb65/7934446100.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/77922153550.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c69suo34uoce30cvhfmk82alof/matesarar.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608334e064824---32010497740.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/39cbe9edf389b4cb961a2777cd0d56e0/17529668375.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/862e17b9a23a38ac556fb39a1602f963/94769300481.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609704e17fd38---67344347767.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e8d42035---30290096002.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/kqbbc89iheuisok1pc2783kav3/36893284425.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/27184681145.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c24be2bb3ac---56324099544.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/43567554015.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_off0000ba02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 15228 bytes
SHA-256: a606a4170f05c947a5d4cd37e4b9bad7779d6a9398a49078a6d62ba9ed28625f
font_02_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 10880 bytes
SHA-256: 3f1ad3d7ef1794b6478fec1eda05273a7e1d0ecbaebf13b43cfd9e55a2cc307a

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