Malicious PDF — malware analysis report

Static analysis result for SHA-256 7767ed5af007dd5b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 06:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a2af35f4b57070fa7f8200bdea11967 SHA-1: 4be2e1eb792161edb56b8c368210496f3a2be02e SHA-256: 7767ed5af007dd5b19674b6df117cad9a9d42a91386c23e8872ac9115cffc537
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/c4e454cf1d54f2930a8f65c9c9de991d/degigilinuv.pdf In PDF document text
    • http://medical-1669.com/userfiles/files/loragabirinawadok.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/lenoxipavovotevutabebid.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1198d2fba20fc981c4e4beff591ca21d/31421670824.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/86019183774.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xiwisi.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/54330303062.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/dilesavurevo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613506c7eed14---55814729061.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/tukotozijepedeniforepi.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/61974747949.pdfIn PDF document text
    • http://shahgrp.com/uploads/92031103290.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/56806437831.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007dc4bfd6---wosiroxexutaxos.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kukomamidirokujonujibev.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/86530306349.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/rifozarotipij.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/luwodofubibekebekukozot.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/57300785722.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/zenofe.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/148bb9f1ec12e4531dd6d103e317d06e/21459565958.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/20132366656.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/gomedo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/1f6002a9a8b7ed893a8f67fc5a89801b/23983932953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pro+camera+by+moment+for+androidPDF 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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 17892 bytes
SHA-256: f5a9b6d37b370240984bd50f7d4de0964c4e5325bd00e8211f475e8a03b19624
font_01_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 10680 bytes
SHA-256: 0bd8dc6ae07f8bc50656c6ae57790724f2a6f81cf0e17040945ee9116b55d007

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