Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77e48e8d09020ff…

MALICIOUS

PDF

74.5 KB Created: 2021-09-22 22:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 502f37298f14c6dfd3683b1c7dcd35a2 SHA-1: 39ede5c5dc4404b81891508bc57ad4e5af47b56b SHA-256: b77e48e8d09020ff594f10fdf5f8d78689fcf5e0c3dd45ec6e202916452abfdf
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or initiating redirects. It also features a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://qfse.co/images/uploaded_files/ckfinder/files/1630972257_6e20ec9d3a.pdf In PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/milipibumulizizi.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/ledojikarasewimudefukije.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/15762556689.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pdcnibk0d1mrrclv24ru8rld90/livuben.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/91856841821.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/14104015680.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zenefabaxokitokowobi.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/90273798426.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/95324753094.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/jupelexefazinosiru.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614809b44fad4---timorosajezofesoradop.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/13761627014.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/jofaxomizonufiwegagam.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbcca2398---wuditan.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0acfe6f9e3cb67da97deff64eb76f71f/japupidulem.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/thqk0f4jinpksdradjkd56t1g5/dosipaxikuf.pdfIn PDF document text
    • http://sun-tes.ru/files/file/9566894141.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/65308707886.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/cf382772dbdccf6691660c2084661628/85328495435.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/47809479235.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/fatazilijadagezegake.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/74905832585.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/joboz.pdfIn PDF document text
    • http://domario.ru/userfiles/file/55117665782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+free+movie+streaming+sites+2020PDF 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_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 16072 bytes
SHA-256: 920a116e567c8b06d4f4121e3622af31061ffe757682905aadbf377e9a309c57
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 10872 bytes
SHA-256: f1c1bd1b86fca9e8faf2f6bddab4a4c4f17bb4489348c5137d0273ff9fce88d6
font_02_sfnt_off000103bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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