Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c415a6bfcb3589…

MALICIOUS

PDF

75.2 KB Created: 2021-09-04 05:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e13ac4a24e8e738d950f385d3ecc58a1 SHA-1: 5904f6e9a94fead1ce285307251e5c0511cd779b SHA-256: 80c415a6bfcb3589072337ea7178cc2bbe5c9cfc6fbc7ac58273967562b35e58
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, suggesting a link farm or SEO spamming operation. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the presence of many external links indicates a potential for redirecting users to malicious sites or further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d7eb5e64---17806737059.pdf In PDF document text
    • http://mousike.it/img_ins/files/betojugipufefepemejaf.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vefexagemizudikugekugar.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a92774c1d0d---sifevokusedevixerotal.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lujijofakuxomakuzo.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/45565032024.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/tovazo.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/67118890769.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/5617739553.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/vatirepebanabab.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/bogezivorutajorafepuv.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/40954370731.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/221e019a3f604582c81ff0cc87b032e3/benatisakomurokarofivir.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8eab00dd8f44094ec8295039e0039597/lijivapobajor.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c4b7d8cd7a28a7931336932fdab1a781/radijolajomid.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s4f9gfsi844e3pdutntehgg7i0/42459181110.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n2m528e5qn02akfikh680jn1a7/58040329341.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/lubuz.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/saropemugetofesitas.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/gavovo.pdfIn PDF document text
    • http://france-ex.com/49408130460.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/12749041178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=surah+noor+pdf+free+downloadPDF 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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 18084 bytes
SHA-256: 4ccf911102c036c8448c19a5be452331cb3f5296eec79fda7db6c04dc0c77d10
font_01_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10496 bytes
SHA-256: 4fc3d4e54e159e60da103b616ebd7618ae5c3e16844a11e24ed59a544ebc81d6
font_02_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1