Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e52cc84132de86…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 00:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2293a324e6e96aeaee466d9be2c6bdf0 SHA-1: c89412ffa016ec7a3eaa4ff0c8fa83ec264a0f7d SHA-256: c7e52cc84132de868cb611fd0a38a441e30da1be5d6301ff42782feba7d862ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trip-sale.ru/userfiles/file/xubobemamupanaxunijazel.pdf In PDF document text
    • http://stoewebdesign.no/userfiles/file/pofotorozunivofagi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16084b02d4d587---fuxamil.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wotesonatapejunak.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/3660704274.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/23465524921.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/gudisilugo.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/povusaj.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/dmgjmdra4gjdbkvt90e214itml/88356344699.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/c63ssjocmoh6l3k9ghat0elf1v/lezipane.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/22860100823.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68d066055---506341937.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/navazuwoxosutunaz.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/bemuti.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/30102017010.pdfIn PDF document text
    • http://devveb.net/userfiles/file/zimovubokatut.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8b3e044377493cc656af06f5fe425461/14245176437.pdfIn PDF document text
    • http://usmleworkout.com/files/file/49064751989.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/34367938629.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32bb7fe90---66754257484.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/32122612678.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ecb7b895b---gurazi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612997678c8a8---potusamizotanifet.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gupesomirofifuliresigufo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160910286771d5---67703904537.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pojikexugeviji.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/94975767800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=building+the+gymnastic+body+pdf+downloadPDF 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_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 17768 bytes
SHA-256: 9c21093b26544c281f8c0b7eb8cac7f6b23633f5210304844fddfc2381291e7e
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 11460 bytes
SHA-256: 70080477bbecdf26bca2e51fdd2d07acc04b1f48ee2712cc095001597918f4fa