Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f94156204da3858…

MALICIOUS

PDF

111.1 KB Created: 2021-08-09 05:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e37ebf30d701e797b2eb83f0e72be0c SHA-1: efde3d892f372175e6e217b8812c59aeee1742dc SHA-256: 4f94156204da385835b1d750bdc4119e09f7b0b981f42847aaebe97420e654d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, numerous external URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=maplelegends+genesis+quest+guide PDF link annotation
    • https://dubaimotorcycletours.com/uploaded_images/files/tomixox.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b42d41ca1---redunabe.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4834880fe---tugewe.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/7607787936.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c15on6map5sc8bo2a1ss44nba3/60297799961.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/69456534727.pdfIn PDF document text
    • https://maisonforville.be/documents/file/xamurizinor.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/namasewuxodomuvagereb.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210626034725623546915ymj.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61b0447ef---59182348136.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vojekenobomitawujalejada.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/wisibeximosatukukenituwop.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/belifime.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/58459470594.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/71497059715.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b67085740---xesevovexevevu.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/savemegazojederizegefok.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/39273915038.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c21f6a66df55410ad8a74bb4c67d6d48/1460206526.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/lo75m39hi0eis4gk51guchdf5e/dazazig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce4d20da71---savuzawamalasapeb.pdfIn PDF document text
    • https://cargobull.cz/res/file/vaferuvekogamipofagogepi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed6c62c95---jadugijijatufonuxabu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f375433f---63038501394.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/94270190360c490c8e5eb8.pdfIn PDF document text
    • 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_off00014aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFF 10584 bytes
SHA-256: a79832bf7191451b5483ea6f0b8c59bae059f7fd2639811ae5c4c6d343eb1db5
font_01_sfnt_off000162c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD2 18392 bytes
SHA-256: 4e49791db61ba36d645ddbb1125102b2a3bed17695e490535691fadad2a9e418

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