Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a59dc223054aaae…

MALICIOUS

PDF

72.8 KB Created: 2021-06-24 04:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0aff96657959f059760095e3a9f9a2fa SHA-1: 88df0ddaf403051ed8b54aa6a61fcdb9e3d20a81 SHA-256: 3a59dc223054aaaed67197913e3f5b21f59ebf3ee25290e61f7f104f90ecbd88
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to external malicious resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bct30h81n02rd92tbdmrt8jmpk/60766407622.pdf In PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/4327225848.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210530061007.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/770cps2ja3ju85brai47ucs98c/32373368036.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/652c491f9edd0755aac439d5f99f5729/togimididodajuziwesur.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a7836ad8---5504622766.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c18deb4166e309224e9b5b0edd31a66e/19176216759.pdfIn PDF document text
    • http://wawa757.com/uploads/files/talekoderisurekupu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/1932547532.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0cabb479---1308979553.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4dfc8f549c8f3fe30803c84f28356ccb/lerurawikoxevufijolaxepi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/f0smna0v7ggd9da3uml71tgb60/20428884106.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f77d9d105---14737445473.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734ebb1551---68662083050.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4e7ab3a53bb21a251ec8c1daf74cad05/4030297209.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/56485247429.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/jukozosowoxizari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+hyperlink+text+in+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 5028 bytes
SHA-256: 20d4227706e08e2180f26742b58a82e42d615e4e7c85d9a55cb8ad1411fd883f
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 11312 bytes
SHA-256: 3c9b47b9febdb4dcf2d8fecfc6e2a34d36bbd47ff79eacedadde4b83ca7c6c0d