Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed323864afe0bb10…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 06:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8f683cf9c2a9a06e8e39f880078ddda SHA-1: c6a330e5e8912a254295f0e81236558f153c2b0f SHA-256: ed323864afe0bb109d5f844384f5af54828771b7860a90bf884e31d31ddabf67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many of which point to disposable hosting or compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://artsar.pl/userfiles/file/37812286641.pdf In PDF document text
    • http://tryinvest.eu/userfiles/files/delikokofaxegawopi.pdfIn PDF document text
    • http://dd-eng.com/files/files/1937859645.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/24156578581.pdfIn PDF document text
    • http://voijin.com/userfiles/files/24215886541.pdfIn PDF document text
    • https://ever-progress.com/upload/files/9168224480.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/kefupinukonolupes.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/24cd7ee6de8884ca4c4f290152f6c3e9/sawumunofokezopuj.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/teworemojedopumubesekeved.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613655136e481---femijenuvidibapipo.pdfIn PDF document text
    • http://arsvet.ru/img/upload/12632335070.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1e20d5abc8523086775f590eb0b89ef3/voxetutoxapetokef.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/47142060568.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/43091789847.pdfIn PDF document text
    • http://belst.by/upload/file/wezudenixudo.pdfIn PDF document text
    • http://poorclarescork.ie/images/rebazebadajuxejevoxabibu.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/jekuvimekose.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/38690911904.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/70743287692.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/labikogaluxazenigukejuna.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/485534090.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tagogiwosilibip.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd423819f---mitati.pdfIn PDF document text
    • http://taociren.com/upload/file/210914013129742252yy2ejp6po7gg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+app+to+send+videos+from+iphone+to+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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 10836 bytes
SHA-256: 0525308dd255fc6e03d92e553ddc26082c5e74139ad6dfb13d6aad2ab0ee8fd4
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 17604 bytes
SHA-256: 69045d8621446178a4b3497513df7cbc32a4b08a93bc51f174aeab1f2575ee6f
font_02_sfnt_off00012b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1