Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd25f3f4a502ed23…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 11:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72baa244cdadb0c880e6701e82f9915 SHA-1: aefa3e4b11f67269d2668e3e2ac315d6eadf440b SHA-256: cd25f3f4a502ed23edc05dfbd1ab9c21bc3db48c10de28b24cc16a85f7b7830f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous external links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update, a common social-engineering technique to facilitate malware installation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=my+chrome+extensions+for+android PDF link annotation
    • http://kokocurry.gm/userfiles/file/54761488748.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-19/20210919053732258608.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/15834982392.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/newatusaxox.pdfIn PDF document text
    • http://kisito.com/userfiles/file/buzedag.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/43882386025.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/30552315183.pdfIn PDF document text
    • https://felicityokolo.com/file/karafuvutavalax.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tetagiz.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613310b16700d---molali.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/6123554081.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/sorovibufuvimidej.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/30240554084.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/89183199426.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/kopowotasimisimu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b53640b9e4---vakirizodogelo.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/kopiwebipitu.pdfIn PDF document text
    • https://attack.lt/images/files/19718721062.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/70d6d1509ac3eada0b40f5edda710908/lamofowimodegavuwinepiv.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/73592290539.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917050223.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_off0000af48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 14664 bytes
SHA-256: 7e45238a22fea6eca7469655fd13e9568ef6422b17f8a20cbc76c960725fbaea
font_02_sfnt_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 10904 bytes
SHA-256: 21e5179246970c5726b5bc69433cc44df0d10b1696c42e7262dd681c35c27d84

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