Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebc6268e3388900…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 23:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9510ebb15605c523f7f189e610f12e26 SHA-1: f2d18b55bf8647028502f7c422005170125c8bd7 SHA-256: 1ebc6268e33889006a1796eafa03a0b9c8bcc8698a391180f5b72ed1a10eb37c
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites or for SEO manipulation. No scripts were extracted, but the presence of many external links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://mishelik.ru/userfiles/file/jabokimoxuxis.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/7imm6l0l22s574em3usg238ag1/69931114620.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/80c27b6367dba9070f7d8c3aacc40139/begenuwojen.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d576fc87db---7274041710.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mer0i00d4i8mkakra9sd174vh5/71132788129.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a551e293b7---gimefovo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc49a4709f---21944382628.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/fawakekemuxunajajolipeduz.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/vosepakabudufo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160aecefcd0626---49808418376.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dda8557f---24005124607.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6pmm0m5ui7pvs5quqib8c148pd/befogosebevamubixakebunaf.pdfIn PDF document text
    • http://samtle.net/ckupload/files/tukukajavozimijid.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe5271e2c---38594283034.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/02qc29iumhdvrk56g1bm2gtogc/xegojutu.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/remuvewuruvesepixakal.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vorujadanek.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/kijepeme.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7plccpv7kk4i6vf44o3infn1g4/xuwudinukunaxeban.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/punolojigedisiwame.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/77421018015.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/48980941855.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/d518cabf796c587a2241e7815393ff58/gumakudixafegudegivo.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/29110621218.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/vapiwojimujevubumelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=overtime+rates+worksheet+answersPDF 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_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 10596 bytes
SHA-256: 13e693189615980753cbc6ad98aea104fb6f0d9031a10d721ca0f0589f2e49c9
font_02_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 18920 bytes
SHA-256: 8914baeab65093f443026f2a88895af00f8543553c9c89697e814e2ce10539bc

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