Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd66a93a71a37671…

MALICIOUS

PDF

138.3 KB Created: 2021-08-03 07:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f5d40cad47c172248a2e66ee95d4679a SHA-1: 5d6f14eb63d8d99a42776f4e26ddfce2201f494e SHA-256: fd66a93a71a37671eb867f864e509eaa20b03b88a69835eac09d7dcc5e0a62b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure suggests it's designed to act as a link farm, directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3ujfddjk53t858ih6lao43lrq4/rogafevadegotesobenimuke.pdf In PDF document text
    • http://aliceinformaticasrl.com/user/pages/nagotatakebukofusomomasid.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/wifisijibatuvedugusamawim.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/81577851072.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1821278549---sanubuxokusore.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e13ee91c9e---20479105353.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k8cc6mlhfqf0s9jhu7av46gn67/18786732649.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/98637605050.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/77075151016.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/htqfgvth6p2e3n76ntl72bbrtb/6308544843.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/226931a6965a37bf4a9e53d2101b6382/revaxezimog.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e9300b91a73e967fd4920a7e553c2f58/1907987168.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/lopulufusapawusakakagofet.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fcef916aa81---rovemapeboniwofi.pdfIn PDF document text
    • http://tipiland.net/upload/file/rufukisutazoxexotulidima.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/42560207945.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/fer1k12hr2bq1setpods9p5dr7/76664230733.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a8d6a10f0e4fae09fdc9b46eaef76891/zeruzizujudizonobose.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/2694151497.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/0c53373cc01d7b273010fe919c1d8983/fexifesedinoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=kuji+kiri+hand+signs+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA5 10696 bytes
SHA-256: bf4933560a543f72e0d6f67531ebb5b9768452782eb2141c3bb18695ee77d497
font_01_sfnt_off000186bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186BF 25152 bytes
SHA-256: 0e677f61beaffb24cf77eb38f6a182453b2db499f981fda14949fc2352f4acee
font_02_sfnt_off0001cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCA4 23032 bytes
SHA-256: 8f6a0430494a9d426f79b01ada996f0f531c8aa7f3436d550a4dfc0abc340ce0
font_03_sfnt_off00020345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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