Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d1b0ef13164a59…

MALICIOUS

PDF

89.0 KB Created: 2021-06-26 03:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19bcf1aa657b8b4bdf0e34802f905fb3 SHA-1: 40eceb83ca8d24e4a86a7e993f26d9ca488e325e SHA-256: c5d1b0ef13164a599cd3d83f5cdb71a67066b64c33fd75fe7eddcf3bd4b69cf2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=after+the+thrones
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/40096792919.pdf
    • http://arohitourandtravels.com/userfiles/file/97558993638.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091a688ac3e5---megegikuxodajiweduzitasel.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f303c563d0---95237134460.pdf
    • https://transport-vehicules.fr/userfiles/file/16482463612.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31c0075cb---dixumoxikowufuro.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07bebe40e4---68286940828.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce67187570---mojan.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8409869d8d51635cafa27620d3e5bcb/79886359872.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4deb8d549---zoneketomiluxojozesakepa.pdf
    • http://ipceurope.eu/assets/file/44725716910.pdf
    • http://visit-pune.com/userfiles/file/53493955755.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160af8e6284f36---79623694919.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc7865c7d---81654903644.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915f63bf790---97115185169.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/10060cdc1e416b2a0a6c68d00083e1b8/fejirosiwexezagozinik.pdf
    • http://promocode.lu/userfiles/files/75178471748.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lonogosogureselomonobuxe.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfb9508d8b---97049975830.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111e941e54---1668047482.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819f2d2ef3a---xefafem.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f40d74aa6---63870718254.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/44816178685.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210528163708.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa75.bin
6aac770e96afa791235ce5e079a123050be38af2872c7790db9e3e529625962d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 18088 bytes
font_01_sfnt_off000128da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 16792 bytes
font_02_sfnt_off000140f0.bin
ed95b50e682d1ba5cdbaf5835843db836b293c8a54736ae217bf926a6c102e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x140F0 9992 bytes