Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9c9f9c2a180e1c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-27 21:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 532cab6ec7dfedf05021b815fa3a0611 SHA-1: 0ac7cbb3c77029a555ba8d5a2a8872eb78079de2 SHA-256: 4c9c9f9c2a180e1c68fc1a8bc0c62297b6848b7a8e2fbb1fbf409e2c51e24d06
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://wahluenfty.com/userfiles/sezenor.pdf In PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/siziwurogut.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d8952771---dusupikakixitomapuduxivat.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wakotusobebepamefosawisi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1d3020daaf0e75ed89534192360dff70/33841714505.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/85317886385.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zeviroxaxivemawatud.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/41795142154.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/8842713711.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fazuzuf.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/99445102949.pdfIn PDF document text
    • https://makenie.com/upload/files/jejupodidixen.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/kipil.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d6dc9c915---govupopipopo.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/vugefevesax.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/powusojuzejiwupedukuko.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/fakojitud.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/pakorulofixomu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147d2899512d---wujokek.pdfIn PDF document text
    • http://salt17.com/userfiles/files/16600970586.pdfIn PDF document text
    • http://hidramaco.com/files/files/45033283394.pdfIn PDF document text
    • https://iohrp.org/f_files/files/miribabepowop.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/topuferumasam.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/zuluxiwizoratodelavomibuj.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/6674302772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sea+of+monsters+free+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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 10596 bytes
SHA-256: 903c5d2b4b297fddb9a54df815ce94cea93d4776b9a73a72ef8ef9212037d33b
font_01_sfnt_off0000d46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 20060 bytes
SHA-256: c12c014b0427fca87731590fc530138b5499d4a123c494001d4d05775ccc43de

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