Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c0da205c648d24…

MALICIOUS

PDF

93.3 KB Created: 2021-07-10 14:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5a462cf76d0d4edcc95c087963f835d5 SHA-1: af62722d49b969e4c238b73222eb1256f9e0fd5a SHA-256: c6c0da205c648d24fe9a75d87f3b61782fa63385b8e7b937af69b3895d03cec4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gg7tsitl9mrvnu8h3s0bbi9fr4/jobemimoropoxojosaz.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/j3hpuufm4gd4k6teutdjv0bodm/nozitebusugikulazekiteju.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21cd76c3cd---31666527445.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/18958042804.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098620248063---wekejelebetelob.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/58004531554.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f487e22da4---40551796695.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/mogevilomobamuwovulak.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/5keqmutpj09tcc1crarb3l85d6/giwakef.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/22976372625.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/l7gpj364d8mtkk6b8d7saae7kh/sufutavesogabeku.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/kisizosesan.pdfIn PDF document text
    • https://mollis.rs//files/41853384232.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c216e3e687f---231389054.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hi4samg70gn6131j8ebhpuells/4119557067.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/38905577483.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e2154396afd---lorediruridavezezelowiwu.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/bebufim.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6332c25e603e7be03a509b401c9931d1/diwolaguzixotulavawedefe.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5af29b399---46619228818.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/4facbbcfac0456dd95998fa353beb37c/13301327976.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/85935120148.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4270d5fee---lobadulorukikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+does+aristotle+differ+from+platoPDF 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_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 17084 bytes
SHA-256: d6fe517ea92fa78d979df4fd456c3f25a9aa389f7a2380b71cbbf83cd602c646
font_02_sfnt_off00014f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F50 10632 bytes
SHA-256: 4b7c0bcbc6dfbb38b13c2d959d07ab23d784bdf3c5a69b32241fb6a7bfdbc812

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