Malicious PDF — malware analysis report

Static analysis result for SHA-256 6682154e0af02ba2…

MALICIOUS

PDF

97.6 KB Created: 2021-09-14 06:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 99d9017b18194e8ac69a3f295f846dce SHA-1: f7b1901a60ac1ae7d74dd07bb22f00579987d5fb SHA-256: 6682154e0af02ba20fa774529d190f1c4605032c48e87c4d3f29130db85e517d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.prshots.com/ckfinder/userfiles/files/xafewurate.pdf In PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/29439406868.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/33cf7a5352b48c7f7dc05f59a5b758ea/lozosusisifobovedopis.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/fapimunawixeg.pdfIn PDF document text
    • https://stopserv.ru/files/file/gomiji.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210901_67DFB9AAA6FCA453.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/11435409453.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8103a51f---bawexajezilet.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/613f41632a281.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c40aada26---90320083587.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/malasinanuvikevumozofu.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/koluvadamevupig.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/818f401ffb56678111cc75b6c0d72a0b/55669108970.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/63783030761.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/robirivolujote.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/9695507952.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/koberugukali.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b8jbq4opu10h0mlpp6qkgkk826/37952915069.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde85b725d---bepakuduwakupetevolisowew.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/kusejonimevejoverasovage.pdfIn PDF document text
    • http://mlight.cz/archiv/file/9756348567.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/58400214800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+does+rooted+mean+on+androidPDF 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_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 18824 bytes
SHA-256: 50c6803b988f759278dc2359fb9f988995b6a30ad518c7845186740e1f0e3853
font_02_sfnt_off00016156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16156 10460 bytes
SHA-256: 585ae4c6e30cbd676c6f345c5b031cc5e7deefec9b20ebfedaf1f3143abaf733