Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9c62d5c18da9c6…

MALICIOUS

PDF

97.3 KB Created: 2021-07-31 23:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 635f3ab30afc5a01418bfd662c6bb348 SHA-1: 83baf182781689178d426f7973284f55dd7f69b3 SHA-256: fd9c62d5c18da9c6a566dbb4b3eb6e93de4cc42e3c04c2569e782a1ebfdf6639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6f4cd7e4---kojujuzujuduj.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a268f449b82---70749853579.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/lilalapavuwaxego.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/c0d2d614687857e7e06ff871e1d1f182/rexexosifegoxulawi.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/rubopidukutinuka.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086711741190---40904818139.pdfIn PDF document text
    • http://sakem.org/userfiles/files/tulov.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/d25905f69fd7eaaaf76e0c2236b1b26a/zimuxisezoguxakopo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/03hj9u553dhpv9d7naj4ta5d9c/vexipafodajo.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/56478631338.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c725c12346---22026451405.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55e9bfbcc---vadadufe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb02de5c7d---sijesukibuzegileke.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b109881b6---77303817937.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c402bb10f---43350457748.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/btdm0pepuovs2kss17bt36ve2n/45235234459.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c2ba9702e741d90c9ad75154fbce5f46/duxupaxenok.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/dugonevagamigubovoma.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c045ba75fa6---mimukunifebipuba.pdfIn PDF document text
    • https://iwistw.com/upload/files/84537931533.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/utpc18r7k08pkbokicrvipfnv4/bamuvot.pdfIn PDF document text
    • http://centrostudiapulia.it/files/files/bigugugux.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4c49d0cd20d8e961f4ed6dac1fb50c40/gegujek.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607365408921f---72376725892.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef143c8aa---torakomuzikojujen.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/pukonidalivisowogep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+download+pokemon+insurgence+on+android+gbaPDF 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_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 11264 bytes
SHA-256: 208583f4b32ab2e7535b3b1f39c2a48dd8f4a052452591c41bff12ea784c876c
font_01_sfnt_off00012e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 17796 bytes
SHA-256: 267412f21a4e77c3045f254aabf0380ce8ae8022e865c7c9116c26f7589aa8b4

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