Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59c512d98f0032f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 20:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d31186f8d0ab8187833d5461663421f0 SHA-1: 56d6035deff2dee0bc1a4a77bf0885e014d0230d SHA-256: f59c512d98f0032f0af3ffb28d830447f08bb529d63dd150828366a82656c348
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, including a link farm hosted on compromised CMS upload storage. The ML classifier strongly indicates maliciousness, and the presence of a link farm on disposable hosting suggests an attempt to distribute further malicious content. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://brmxn.com/userfiles/file/20210904121743_md4gx7.pdf In PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/tidevakafajuvabozez.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/kukeme.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/51573494067.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/luxorab.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8354cb3d---welidowugatozorunokami.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/79804458684.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/tileriminogariw.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/soluzularajuzimoguguwuwi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327d89c9ba4---53363089456.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/dagirazujo.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/51975396360.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/76914811363.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88f1b6ee2---puvepudujowe.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/38143734399.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/41393743234.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142125805706---16116849706.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/26582331399.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/68571286186.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/6739261306.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/83919684585.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/regegevexupapavavinomiruz.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/42080243612.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/fuzelelova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+queen%27s+gambit+watch+online+freePDF 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_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 11252 bytes
SHA-256: 816f434bc4cbfd2f1d13617d67cd856d8c47d30422392f5b42ecb788e2152bbf
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 17752 bytes
SHA-256: 6fd3723cfd05ba28a6ce94bcd756263719d94e1969952fb83d4270621095a9fd

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