Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19326755f9f567…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 11:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 473b29c07f6c4cbe3d274f6a90afe4e2 SHA-1: 83aa73c72b43c235f63fa11981f656cb1e4c1b32 SHA-256: 7b19326755f9f567cc40e0e669616a70b8fc483026a8498969a35bf26651ca3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://makrostal.pl/user_images/file/54617382430.pdf In PDF document text
    • http://nuk-amro.de/userfiles/file/64332039784.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/giramanifadobegubude.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/85978630185.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/81304153478.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/86297191875.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nekefuxoteze.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/jijuxomin.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/33396764263.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/dabolemagajugoxinifesi.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/lirebafo.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kedidalogasunakijexasun.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/tojekogologurid.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/garekejonidage.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/88733156025.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/tolosibavido.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143949dd7d40---bonobawul.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141922789408---6728250953.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/kegal.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/zimogetut.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/voloremozomun.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9253218a0bf0ede1bd5139220fd75b80/57339659954.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109032003013203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cara+membuat+aplikasi+android+online+gratisPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/lobili.pdfIn PDF document text
    • 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 17360 bytes
SHA-256: 851fadfd7127e11ee2a8b7442532976030c211c3c56cdb15ee32181e490f2810
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 11096 bytes
SHA-256: 7438bbcd4ce1b964fcc1e958fbb8bf28878c80adad73a3d5ded51e27e5cad618
font_02_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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