Malicious PDF — malware analysis report

Static analysis result for SHA-256 8234739a6f6a6a75…

MALICIOUS

PDF

92.8 KB Created: 2021-09-19 01:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31918587f1db2a5e9bafb8c2e5ce3cb3 SHA-1: d87da5670a7e5af1793f6d2da46abfb21658a2c9 SHA-256: 8234739a6f6a6a75aaa3605f0f75b573751817d9936a2ec6a59e3f9403cc6526
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://seedcambodia.org/htdocs/cljr/data/files/naxoretiwotuzemag.pdf In PDF document text
    • http://paoladebenedetti.eu/userfiles/files/jiribofesujinugunimemipi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0a62j5ic2hco1fj8mvv4uvnji3/pobabe.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/93773269785.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/jebisom.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/vazopojuguwike.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/98084509456.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gatalozaloripen.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/wujexe.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/92636386901.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/zemuposusijokugakolu.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/gigukojawowawozad.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/powapivejalebum.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/34958901871.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/9925701022.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/vaxinateg.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/zelofemelofanigeko.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161429d52ea273---47872369115.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/baleveseta.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210908185113_610294692.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9ce4b8fec2fa0fdb0149b78d69d1c480/20430668898.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lonir.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614444469ca10---32727894718.pdfIn PDF document text
    • http://domuran.pl/files/file/82623260476.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/37469572618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+take+backup+of+android+phone+on+laptopPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 10960 bytes
SHA-256: 4b94d017a844ac5c8272ce55ba31646cd952fdd68ef4de1d0c5a332986ddd55d
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 17964 bytes
SHA-256: 436ae934703db13fa3a08ad83d54ea42f0fa30d179e10d820d9e4ec949bf27c1
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 17620 bytes
SHA-256: 2f2f3f5f9f214b667cf9cd3088aaa95418c367733715e9bd56098d849b55942c
font_03_sfnt_off00014ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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