Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e8a455fa58183b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-16 22:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9ea9ff5656a10f7947a70ee7aff141f9 SHA-1: 145e0013caadcff2899dbcc244deca7520962420 SHA-256: 86e8a455fa58183b429abe0a45ef2e0d12e24d84ca55d0b707ed743cfe9f0eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrustworthy domains. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to trick users into visiting them. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=aplikasi+membuat+animasi+di+hp+android PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16134898cea801---risapimogomason.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/26940245350.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/jadamepi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614259cf63e21---fexopusunatazelepuzirim.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf9f9a4ac---fekevepopikerureb.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/kimabomusupolejenudopum.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4899cb3529359fe809bba378dc89ff1f/43340865668.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/56581809840.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/wobumadozulovu.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/75799309791.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/bafubekoludob.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbb42715e---41258939695.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7ace7a826bceb120368baaf48048fb09/14829069762.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210903040006.pdfIn PDF document text
    • https://membermimpi.com/contents/files/52433491003.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/35351118577.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/kuwujaremofegapowor.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pebafukuwesexule.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/19592482174.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/10769748490.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/94518131711.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_off0000d4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 10968 bytes
SHA-256: 954f7651da3c5ce453f67f0b7c92f01ffb0a7f0f26af693da401853a651f034a
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16388 bytes
SHA-256: 7e8e4a3dcbf1d9467c4d349507af5503f3f3828cf8c8f739f4c6cc812e68ec39
font_02_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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