Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ce8ee3e51caf04…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 05:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef17fc8c175d17e384b12bb75046a008 SHA-1: 468ee14467120378fb9cd021dc84b235734ff0aa SHA-256: 99ce8ee3e51caf04fa0a8ece41e94d5cdf3585a3d992e286426ccd5d5c3e60ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous links pointing to various domains, many of which appear to be hosting malicious files or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161032350b0193---tejulelinafonususedujopur.pdf In PDF document text
    • http://agrion.org/upload/fichier/midoriromazin.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/werabevenirodizikib.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/biwireviw.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/xujegusiberavilumuk.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-15-13-03-15-57.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/pekobigevakip.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/tolotesemuzebokovifomog.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fakikofiduk.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7fcei41dh87p4jhgllq6doemv4/wezeserenafugupuwisonagon.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/69221883467.pdfIn PDF document text
    • http://atek-ent.com/upload/file/surifiripob.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/92973104601.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/35345141892.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f249e6762---sunukumizawo.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/39697539764.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/neparodagisifodoguweze.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/sejexafiseruwexasalisij.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-10/images/files/bopunasaleruzeniv.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/36662643982.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/21615210901.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/narokaruzub.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/7cd95b5cf747440d4bfccb54ca9c59e4/dejozuluraguzaxeguja.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/12137241611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=communicative+english+language+skills+in+pdfPDF 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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 17600 bytes
SHA-256: 4310bd7bfe774c531715ee855825d873cb494db31a7354f3d3c897e662ffc93f
font_01_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 11256 bytes
SHA-256: 70492c0d434857469c4b7def9ee0ee15be60ff71d95a029358d4786d2d6f5ed2

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