Malicious PDF — malware analysis report

Static analysis result for SHA-256 248107118acfc5b0…

MALICIOUS

PDF

79.6 KB Created: 2021-10-07 17:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88a9eb63b9958204d248b15b3aa456ec SHA-1: 6683907bb9c524c85d672c3c6c91c68e6b031bf7 SHA-256: 248107118acfc5b069120c7cc998301c2ebe6faa38760c78bfae233d63804ce0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting and compromised CMS uploads. This suggests the document is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://onelove.cz/file/mixugozibimabupamemudede.pdf In PDF document text
    • http://erdenetpost.mn/userfiles/files/kugulagijuvigeritexelit.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/dawapisanalojaba.pdfIn PDF document text
    • http://medrea.ru/upload/files/xizaviloravukivukuxa.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/fukususamafafuvakatewuvi.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/jifowojojinefonemawa.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/podinepaxunedinenivawise.pdfIn PDF document text
    • http://maxbrio.kr/files/files/samumawot.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109151010569749.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/tujezusax.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/rizerewezavewomuv.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/zumun.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/7533439824.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/320495e3232334c84da0d9aa5bf86f65/77812790447.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/hon5vhkbdei7c9qv78eskdb49v/jomebiwekasupem.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/vozawalibofusutetatesufe.pdfIn PDF document text
    • http://kingsshopping.abwingsmd.com/uploads/files/36263505906.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/13389c0a82086893c13a3906416d28ce/tujebiduzedubi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/pavovo.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/rajexemimekujabivufon.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/23598582175.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/95274285263.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bc82e460783b673cee384bc2c86fb0cd/sitajapiliro.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8bv3tmg78eu75b9a7umsf1n1qi/ragibaximisadunadivaxil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=kepler%27s+second+law+examplePDF 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_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 10696 bytes
SHA-256: b2fc6a3b0b919f877a9cdb4ccf6e3b2aff03a835047d462d7d1e6f1350facb2c
font_01_sfnt_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 18660 bytes
SHA-256: 8b9b5f61da1f4f50529d52c50b2b1d71808a8648e190e39dee586f283f57a9ce
font_02_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1