Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca87fd3f046ab59…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 04:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e8a526061fef4f68a19e62d238f348a SHA-1: 2a5743dcfb84df47d092b977c4769e78d713a23a SHA-256: aca87fd3f046ab597985b788e19c887f30606cebfe66f99974c31707da61d2a8
164 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent. The presence of a download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608671adae5f9---47387428490.pdf In PDF document text
    • http://marcth.pl/media/fck/file/dalosurebepewos.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/77785094278.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bf8903de---fexumepifajumazasijawu.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/8450666736.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/43623305678.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/risudobigezusonerel.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/65043553107.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edb59dd52---vijel.pdfIn PDF document text
    • http://446888.top/userfiles/file/xupobetudotadures.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4230452148ae558410f1df7718de7e37/92886764280.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/dowenifivuworinaroxamikuv.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/18882030224.pdfIn PDF document text
    • https://actor-conseil.com/files/file/latureradejelimadip.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/jalepixemisixonan.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a000d1b32df---85794155829.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/1152294352.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d2744c87be7097a049b57c6f4a286c2f/76034691053.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/86aa41dec4c72d3e7d951caa9222ab56/21754509652.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/29550641765.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/ladefanal.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bvmqe4vl0qh2vv2elg43ht1k60ghnnas/34470887038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=zimsec+a+level+economics+past+exam+papers+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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10912 bytes
SHA-256: bed1add2ec4cc481581b03677889020b7e9503ff0778338c4c058e93f5e5dc45
font_02_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 18384 bytes
SHA-256: 7fa31e5f4a8913f32f48dd1cd021f2d416fe40bc0217aeacca1fd6f26fa03f0a