Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff92b64afcd19d9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 14:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77c39a80d72325057ac777280e711bb7 SHA-1: 0f86c45d997a9cfa74a4548782dad524488a2350 SHA-256: cff92b64afcd19d9cd8b149a59fc16e2a0553f3dca854c2b4eb289ace634baab
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially compromised or disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://alfavit.tv/userfiles/file/5145784226.pdf In PDF document text
    • http://assytekservizi.com/userfiles/files/16051487823.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/xejudusopigiweladotuv.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161389c7ad6dc1---83719144181.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/zonanewozew.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f962c5f44---poxoketuwakix.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/kuwafinigu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67d79b20f---67202640393.pdfIn PDF document text
    • http://dzbnf.com/upload/file///widikotitepiveluvabupiso.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/42489970274.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/4847096615.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/47528045436.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908110907.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/sinoxik.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138378e2d29d---lofovitobewavepilebeba.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/2913962730.pdfIn PDF document text
    • https://servicepapik.ro/files/89744783639.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6b4duq0eg6nmqiv8rui2i1kdts/fokabefukomirezivos.pdfIn PDF document text
    • http://elitacasa.it/images/file/jusuloju.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/rugetezizagogesid.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/milikizimemulitiv.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210913021457.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134db8be2f4b---nanuzimifuribewekovamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=magisk+apk+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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10744 bytes
SHA-256: 7bda2ce2cf02e2c6efd607dbb445a3da92c0df5ce4509fca8cb1bfc355d6b4ee
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 18832 bytes
SHA-256: 4a0efb25ce30241d9affc6180924f8038dbbb29155ba3f2180f998d227f1e1d6
font_02_sfnt_off00012a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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