Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b2df2c8ee0dc54…

MALICIOUS

PDF

73.0 KB Created: 2021-05-03 04:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19042f039f0921fed0f700d97dd07ba2 SHA-1: 7dfdb0158856a21a139a9a6b6d3a488f99044c1d SHA-256: e1b2df2c8ee0dc5469f632f0c77f907a6ac0debd6ba16f149cb09f574a355f51
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign, potentially initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/48845954f0819cc1762c7eeb95b86386/19417443813.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6qo37ge4gsth0afrtcij7ap3o7/63866335363.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3198d5a8a97793f07cb7ebd571794e60/10770001110.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/46255cf329f961208a0e859a271b5201/perizuxavozuzavadiwej.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075341d54df9---sikaduf.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/75mbt7riar0u3crik941i6of6f/sebepuretexobujiw.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16078564d0f483---jexekevisalelo.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078025f3659c---posane.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fcb68b9d---40701757947.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f5e73959---gurawuwukatoregodekuguto.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1347c3475---tomijesenojij.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9c44bc03324dcea9e314d303613b59dc/kusovubaw.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/db6735436a278490435ad6ce7b12eefe/67886199144.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6ef5282f---piwikepelusimokinosejor.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7f5670615a787faf48df2f8b9bc2fc81/wukalaxe.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730be4e5aaa---xexasepol.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42627e8b9---nolibuvutupifagorugomatum.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc31d0d15---jotidexakot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=google+slides+templates+school
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def9.bin
165bd675d900511a4e5e9549760a5d34008a49619de6d5ed65bc6ba4dd6ae282
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 5420 bytes
font_01_sfnt_off0000f149.bin
819bd86e15f257dc69f9ae4b4e6a22c16bf94599c6ee9e08a4dd88434c4b2a3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 10440 bytes