Malicious PDF — malware analysis report

Static analysis result for SHA-256 dededc6dfcbc1c2d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 12:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea8d6f53926fa09498f200c1d80193ca SHA-1: 290db8a257c3aaf1b40177020be90e8c07ed9113 SHA-256: dededc6dfcbc1c2dc9ae04d9ab422c0474f74b77a4584a67ce6cb8493cf22992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which are potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160971ba022762---kufafiwiwetejomebozani.pdf In PDF document text
    • https://audit-advisers.com/userfiles/file/katezarugufikuvesu.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/nixuratilikobeledowetafer.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c12b24d0bd1---lopezene.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/ladewefugi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/32537f04ebfba20a1460badd4abfabb9/kixusisinofokuv.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/5000179378.pdfIn PDF document text
    • https://masukpt1.com/contents/files/7287194866.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1607e021647f55---konopolosowonodabenilaf.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073759d537d6---novixowexikopu.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/99097990608.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/39850058482.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/teboborulekusiwod.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76e32c3c2---33833492163.pdfIn PDF document text
    • http://artside.org/data/temp/file/bapesexorupom.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d4bc2ad3af85bc462bb45938dda89118/62152875388.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/zapomebuxuvodatolepaxus.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e88b82a13---92962734370.pdfIn PDF document text
    • https://alpinashop.bg/files/77272212865.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/03/38763980096.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/guduxupisefuligurisik.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3biqsr850c92nr89k76v6aco41/42250730272.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/b5917512f6daee4e28b1360f1d4d192c.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=everyday+sentences+in+spoken+english+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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 11152 bytes
SHA-256: 1bd622bb731f5fbec472e72594298226c1cc60e4e5368459751100207b3cc6da
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 18380 bytes
SHA-256: 3313d6413701cfd5695a72bdd02b2023be9e76ac409e611b1add02903919785e
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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