Malicious PDF — malware analysis report

Static analysis result for SHA-256 040698a8ef4f4a60…

MALICIOUS

PDF

79.0 KB Created: 2021-06-19 13:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 98791b8f48d42d274feb699b96beae51 SHA-1: 9a494e5eb7e265c0300b844ceb8647fc314917e5 SHA-256: 040698a8ef4f4a60057aab4a87c528e1d79d56826474a8738f0274241a888d23
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://crewmak.ru/uplcv?utm_term=200+pounds+is+how+many+kg PDF link annotation
    • http://dinskayarealty.ru/media/file/wirapejobowemugifug.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/pevirelame.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/pumofixogesurazeno.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c49c7994---naxinufofisex.pdfIn PDF document text
    • http://orderkai.com/uploads/files/69943422613.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8l0pksjcl0505qjjrc0ntr25p0/kinagetigogakede.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/34c21f0d6e081461a74691f142cd56c2/89018068414.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/69250026241.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/lovuxupa.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/8r42h2td1vvd323aqv9dsa785e/4529914949.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/40031479083.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/5l205o3j1jbm1qcplcru9jj206/7828692017.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090170ec7244---31053612909.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/46230719226.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91cd2ac1116d0c939b6d8e856edea653/popakofawelisarajit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 5368 bytes
SHA-256: d49efe1c73042241eceb47e3370b4c77cf08ed5ab464e42bfbd88cc094287260
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10684 bytes
SHA-256: bcc201907bbf09050e1ec9f9c1cf2767fe694a630fe3738b01483ceecd82bf31
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34