Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98a2519d5ebb4c1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 16:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc05ab37c413020fe9d20f247fbd831a SHA-1: 96af09142eca83b1ea632d91423f9ef31f624906 SHA-256: f98a2519d5ebb4c1d82d4dc3f9be3fdf516f4b1fbdddf032e7862e309ed843a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads and disposable hosting. The primary function appears to be acting as a link farm to redirect users, likely as part of a phishing or malware distribution campaign. The embedded JavaScript and the nature of the URLs suggest an attempt to execute malicious code or lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15d3b18b1---pujiwumuraxakesovudenu.pdf In PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/toferuxe.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/gefazanodorazateji.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/dinodozisutame.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3mblnapuilmdba2dqsod0johru/596587209.pdfIn PDF document text
    • https://norservis.cz/files/files/21410793036.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/18194786451.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/nidinufexuzof.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614948c56e9ae---14697776740.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/12588357863.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/guxowoda.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210911125823160359.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/57479181620.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/beweg.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3e9db4d2---fakerofofapaginumubu.pdfIn PDF document text
    • http://elitacasa.it/images/file/lawixidurajubutogox.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090921c035---falomikilusoxiwu.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/dinujexiwamomalixobufit.pdfIn PDF document text
    • https://ms01bet.com/contents/files/jolilapimo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/cb45671543151f0665532dbc4b2111b2/katadipiwu.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/66229230956.pdfIn PDF document text
    • https://flyags.com/editorResources/file///41848495615.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090212061073499.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/80441600660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gangstar+vegas+vip+hackPDF 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_off0000b110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 10684 bytes
SHA-256: 3be606ca61c37d08b477b1f501373421e820d067fa2c57f0d786143127949e19
font_01_sfnt_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 14976 bytes
SHA-256: 1b449a2c2d9670870ff4e8df6a66fbf8d0ef4f78cb157c5d5295765c207a79d7