Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83092fd15b596cf…

MALICIOUS

PDF

97.0 KB Created: 2021-09-04 01:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee857a98619777d0c303838a75c71cf0 SHA-1: fa5e08bad9dbe8f47fb77165bf955f58d7993004 SHA-256: c83092fd15b596cffe66d3a3f7834d24903191e67d989c5f1e53cdfea86fc13d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple links on compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078764c0b52e---maduxasobomexokuzupu.pdf In PDF document text
    • http://perfect-gallery.com/userfiles/file/powevezinasarekaj.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dutewikikutupisiga.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/epg36o0vuhum58ljb6j8vgo2n3/jofovifeligilir.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/38231810779.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ieurkjesbe3i2e3svpo81phvg6/26215543756.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/64573647639.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e63b976ede217181455c19b041c031ee/14224202358.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/e4b31307d38bf0f5924370beb3d93a28/burezupawagemol.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/kusabosetixogosov.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/048e2bdfa970783ddc2d1e1042995a6e/viduro.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/xepevoberatejenesabisoz.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/f5ee1ccde7skg52k4gr48mbms6/kogudepasirujudulokul.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/5972529238.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4697f37be---tanekigisuzutuvolur.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055a1d63779---4300407612.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160750c0b7b1c5---zuzitaniz.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ddcf0d444e3f32d7ca5569e185a2d1c3/78084103542.pdfIn PDF document text
    • http://ombs.ru/uploads/files/46880035571.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/97806068834.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/43961400395.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e834007e9aa---69043270599.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/305f7bec68e380e68de3b27aa5293d28/55239143655.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/dssdfq5ckjr49eeb484v7vqg5f/43515276272.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/kt3lq5derfrebsl5r7kiujfep5/nutamojalarezetemek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=energy+law+in+a+nutshell+3rd+edition+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://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_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 19040 bytes
SHA-256: def37e258b4d54cae0496bc54fda87c497d23e72607b7176bc93d5db14b57e99
font_01_sfnt_off0001433b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433B 11232 bytes
SHA-256: 88b9b3b831658768e0ade1e4ac7e3672c05a274a5266401bc119d42b68db2202
font_02_sfnt_off00015d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1