Malicious PDF — malware analysis report

Static analysis result for SHA-256 710e1bb893b45333…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 08:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d921a6a4409cd51434f80ad1e68df5df SHA-1: 34e85e08bc8365f6e4e6155b15b9183466ce4742 SHA-256: 710e1bb893b453336238967aaa5a30bd78dba757efb5999768edc8b1b6b47d40
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload directories and disposable hosting. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dkkarsin.pl/img/upload/files/ridisir.pdf In PDF document text
    • https://perkunasstudio.com/uploads/files/202109050248104456.pdfIn PDF document text
    • https://migger.dk/userimages/file/17150816863.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/69829215468.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/19363423372.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/degogakexatil.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/woxugumasajuxifajufike.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-1/20210901213111559142.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d389724d00d96761cf9d9c85cc851ab5/96323908727.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/19177574198.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/10680468487.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90a504414---3044780779.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109060658089411.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/fegevare.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/dovutijuzobasana.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/72881353338.pdfIn PDF document text
    • https://auto826.com/uploads/files/jejinojivafedafaven.pdfIn PDF document text
    • https://avenue102.com/uploads/file/53944388465.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/femofiwenuk.pdfIn PDF document text
    • http://hueide.com/upload/files/vigojifu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/99688795229.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/41234340418.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/59510688129.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9170022303398dae0fcc0ac1685b6980/fuzad.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/76896715644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=middle+game+tactics+in+chess+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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 17200 bytes
SHA-256: 145d375addafb15ff2a32ace6395a059db15e9cd9b3cf47ec5e83881a826983b
font_02_sfnt_off0001324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 10840 bytes
SHA-256: af83ecc94e047fd26db57c84efc8082cc1d8f8f0dcf2dcc29f60d50600dbec6a