Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e95cb0456309c4…

MALICIOUS

PDF

97.7 KB Created: 2021-07-14 00:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5b0a2dbab33e16ba58028fe0be35d899 SHA-1: ebd5cd35e578a77724791e3e2d6b8397fa892d31 SHA-256: 53e95cb0456309c4ff6c98b4e1484b763f7cb1e5e838b421ba905ae85e3c5bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, pointing to compromised WordPress upload storage, suggesting it's used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is exploited to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087101580ec0---tasagadibewalodabavagamo.pdf In PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775e67f2906---fepidefoxunosevok.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/nijebarujajeroxetovopel.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d83f5c672c91033d78a71c7107b798cf/nanixukimoxula.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/70634219679.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/nsvl9mm2an84sk00tr26q44gpm/jojapawakijawar.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8j2hl520dgiv3gi3aqata78t78/pigigowonafalorox.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/23092784927.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/85046153017.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/98193290248.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/rusiralogibanavok.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c178354bb4c---9315060954.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec77533575---nogovukenewupuxat.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b2795fd5---81583896160.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/4fa80fe95cceb00b4f8e201a4a6f18de/34575003824.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38902736756.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a2fe8896---vuxofikojisosojurusupat.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088072eaed7a---51173339018.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/77922855601.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/c74tshu02pq1i3tl0igcep03eu/48326778335.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4b4792197d30baf566b5ddd6e74ef45f/85019965969.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7804a97---zadimajufevizotobedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=intended+and+unintended+consequences+examplesPDF 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_off0001180e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 10876 bytes
SHA-256: f522c1365cdd5aa3705e6d2a021ac935328ae063dbab6adfc7c3cf3656ba2f9b
font_02_sfnt_off0001490b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 18752 bytes
SHA-256: 8ef6702f39b02feb7b9bd2af3e3f46aab85105c8526c1ce6e95c8dbaf17cbb65

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