Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b038daa236fcc6…

MALICIOUS

PDF

74.6 KB Created: 2021-09-02 04:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d40d917152815a1deab6f658c16c13f2 SHA-1: dee9b99b48f80a2e8514a8991aa2c92a97c36e9f SHA-256: e4b038daa236fcc6df162989974feacda92e989361eb4fd54e70e1c393eb386d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The primary goal appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n7i665oevvjrj99g249v2cljda/zesojirulorupogukilexakod.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94b3a760---60033772625.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/28757832952.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/bojokijuj.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5f237402d13d89dc3c158a1106891853/37066100271.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160789868e07d0---40905837077.pdfIn PDF document text
    • https://people11people.gr/uploads/File/5377451863.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/32613255232.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/3057046482.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pofofat.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/pazuxiwudodolevifodo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/2d35c28d1c29c3a2dc2b58dbfded429d/38358273864.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780a70ed31---kowufi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/543c9cd62395fe13c626b52648c1b131/saxetamirexapup.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/62760405710.pdfIn PDF document text
    • http://stevis.cz/files/file/65583757043.pdfIn PDF document text
    • http://szhlfz.net/upload/mubagatotul.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b221540ab9a---93498030213.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/59302679268.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/8140839270.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/gojegivamujidilupav.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/xiwojepike.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/36088526205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=picture+oxford+dictionary+english+vietnam+pdfPDF 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_off0000bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 11448 bytes
SHA-256: 91d48367342730945d86d952fe22d840e68c5313d00d4de2aa54145b2716bddb
font_02_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16780 bytes
SHA-256: eca78defffea640ea2359e2eeb86425ecf5e59bdc4142ebc27150e821db073ad