Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f757d3b5477c09…

MALICIOUS

PDF

112.3 KB Created: 2021-07-23 02:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 679e806c0e221ad445fb2565b96f252c SHA-1: 7a5e8ca01872a80f574054ed097f0c10d5b59de4 SHA-256: f7f757d3b5477c0995b97ecee1e78708e72107bed68570b435f475dc55ff2f38
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to compromised WordPress sites hosting PDF files. This indicates a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i4bpn3npo0gl8ngn0o7ruvskrq/pubudonegasir.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sjpvcuitfc8bl0t7ueocvg7428/89349734643.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ca509d5a5---puvenu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076de0a74e9b---dilixofom.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/94671374976.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/wuzokowisutabi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef37cd14b---22187473833.pdfIn PDF document text
    • http://agavietnam.com/img/files/nodabebamiruxisedafikipa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0b3c575f---niwunuxaxemapotexila.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9b66a88c9447b4572c7da9c0f1210a0f/10099750432.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4df4cfnra3g81gso6hg78alag2/41684462579.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607afeb546afe---fuxemipavamakuf.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/11669836732.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/v4jldg7m581dtc4d6ffns4krr2/xadifoderizugibaw.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kanulopiredalomaxukibubi.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/1f8a35686b22e499a8020afcf3615881/ruwewosadusubimozobon.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/08a5f78c836c42eac05dd40f5bcc2065/tokudonof.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/jodulukatuwozukaguloxixu.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/68383836898.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784c894e6e9---duvosasewazosof.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/lupidonazefaz.pdfIn PDF document text
    • https://medtek.vn/storage/file/82841982664.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7be88c95c---riwafemalafebawixuvus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+just+wanna+feel+something+i+just+wanna+feel+something+really+realPDF 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_off00014109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15920 11044 bytes
SHA-256: 65b7152304aa1edd4f59d957238cc5888e1102e12875475e34e6fc43ca524e77
font_02_sfnt_off000172ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AB 24608 bytes
SHA-256: ad0064f90995b67e03309cfee4a1fa78db71b2b2a1a82e5553563c7493fc4b0c

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