Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee89c375f92022ae…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 09:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3348d6a5624103b9b49949fdabe0b459 SHA-1: 21dd7fc3670b6a8d196e30f3f0db66efae46081b SHA-256: ee89c375f92022aebd76c95418fa4573cb3b39fd55750ce1025502f320d15a65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=android+app+for+downloading+music+albums PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614251b3d3ab7---61449070989.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/zafav.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/malapisif.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/33818416944.pdfIn PDF document text
    • https://denimder.org/resimler/files/sedabujolita.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/pogufuradunug.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/xatunifelapex.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/94824136256.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/moniwatozavivogejigalanev.pdfIn PDF document text
    • http://vipdiler.ru/files/file/libif.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/suzowan.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/96584636117.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/95388031573.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/n0i0mii2fju8mrmccg93hboj44/46035736869.pdfIn PDF document text
    • http://drtamerturan.com/file/ligozefuzomos.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zukisagevimugu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/widom.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/zasejurobaxire.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/vabikajazadomoduwames.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/25bd6b79bac12466f96a756a998725c7/9394163070.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/zarufijawobogebuverufu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/buwetusowubo.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/wexapedizesi.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/29221575451.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac7b79e29f---93657070334.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/99380645661.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_off0000bd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 11040 bytes
SHA-256: 87a20aa600a6bc27115ca6686ae4244b10623401eb09123367f875d2917017f9
font_02_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 16688 bytes
SHA-256: 79aeb5c20dd8fc7c6ca6769e6d2822d704a40c6aba37d3f63cb13e2501ac0a52