Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed432c517c6875ff…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 07:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52c6bbf4c0af50a960c2a4b5cdeb5fa5 SHA-1: 6352cb59981898aeb7fd869405b77a1b45485b6b SHA-256: ed432c517c6875ffe1414a419fbda189c8f941f8523ad8cf490639312ef76e2a
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of multiple external links indicate an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mlbcsimleague.com/ckfinder/userfiles/files/71639233464.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ed14e2aff575729eb51fccceb8b8de91/ganowirotedogi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/umdh7dmmajfjcahr7erjfmnb76/95736032688.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094601c31db1---woxezivunowubur.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/dovoziferuzoxeluwobuwapi.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/91298903381.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kirodojudixivaxaruwipo.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rudisakelo.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/52627913990.pdfIn PDF document text
    • https://kildevangen.dk/files/71044055212.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2dd8d4139---wijeleb.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d80f4bf94cd286f311b8b22c5a02e08b/nozezasi.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/58118528109.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/refexoromut.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/77407361847.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/74439999595.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1b2758f9d---rovuberemetazo.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/58901725981.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/bironixozipikuvemikaniv.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/35784db56473efba600bc0817219fbc6/69374307378.pdfIn PDF document text
    • http://www.bash.cl/media/file/tujowufatinem.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/bakej.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/vibefedunejinobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ariel+and+bellePDF 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_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 17696 bytes
SHA-256: aba009c4e475d5c4df3500c8b86dcf1a692df5ac061eeadfd32014a63b090eea
font_01_sfnt_off00012447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5D 9976 bytes
SHA-256: 337e67d10ad91c2e260bbb23f78f3ea14f3ae067cf3d95823501d52f3a73d155

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