Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0b737c2dd95301…

MALICIOUS

PDF

116.6 KB Created: 2021-06-26 00:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 93c3b88cdd654fcd67a554e9e35acbb6 SHA-1: 2d4fb78125ba2d28d6414f6dc2b4ddfcf7aee60b SHA-256: cf0b737c2dd95301a4a3196c3baa02c2c5418b0edbc29cb4f7a2aa99dfe21854
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL analysis suggest a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=dwarves+and+dragons PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210614_044656.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gginjehft98n71km3pa8e0m147/gifera.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5v7epkvt52tjko6km5fsf02er3/47974383026.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/19514964795.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072f933ac0d1---56281173142.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5a4de6952ec43c7519a437142717baed/rekegivasilenezebeziralu.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/diwewufudo.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/19302654761.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e55204d5---43412691132.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b3fe36b9ed92e9526cf3af9d59c8d67e/wititekokolasosibafaz.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac8fec675---40043291678.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u3lafk71vq95hbvk6686noecu4/buvujowebuduzawuribumelo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbe3af6fc0a317ec6ddeeef4dd8599fa/84994873027.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/a97c7bad231f248173ae8994500c5d1b/33195947264.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b90ad563196aac17133c834f36574e3b/munezizobufifevejarelik.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/xefamopagenonovun.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ce5329ff88641225af6c802272e0f479/luvesixugop.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fc792f90---95008181354.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ailqu9ta10pqnbejre99e9cgi7/95905538867.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda9f55c6e---lumolixaxa.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cffe1ee532f---miladabenavojojaxe.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8f44e0c8b---66816802168.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/63ba842d14df684237772b1f82c8f535/39052346047.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/bozaziwevuxu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/kunutorazikevovokona.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016601.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16601 24148 bytes
SHA-256: 54fa78d819d197e3fd8d89d494e3d9a24783b90fc3d726d58ff8686b131c422f
font_00_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 4008 bytes
SHA-256: 57dc45b7c8ab7e61bedea10241e1db624b1dc850a4bf3779c20c4a17d1804f61
font_01_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 35712 bytes
SHA-256: 3a08348c79b8a2b06b232a30569764615ddfaead440d9098d3afbf4d91289936
font_03_sfnt_off000194e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194E6 10340 bytes
SHA-256: 2410da318add8d759376869e0f34c176b78200c79336e60784b6b03f0f8b41b3
font_04_sfnt_off0001ac31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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