Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7068c53dd5ab4e3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 04:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0df200ef5101a3be0bf3711109641749 SHA-1: c6c3d562db6b96f72db9138bb3118928cd6fc99a SHA-256: c7068c53dd5ab4e350772c5b40378bd0fab5516f8300ece75a71ad6fefae2644
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a malicious link farm. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing a fake browser update or extension. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://garglob.ru/uplcv?utm_term=best+screen+lock+for+android PDF link annotation
    • https://ctapigroup3.com/contents/files/zexevetononoxitu.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/rafad.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xuzuvalabimunatefuvisudin.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303fcf23468---44336007865.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/rezinegofonobi.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/pinalejaxewuweraviboku.pdfIn PDF document text
    • https://eklyps.net/images/file/64200074996.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/kifowil.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/dofozodubadekekene.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/mibijojelevudeku.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/43148112186.pdfIn PDF document text
    • http://polkovnik.su/upload/file/54141759278.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/minuzawiroxuzub.pdfIn PDF document text
    • https://elemonbg.com/Files/File/vesaku.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/70985437842.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b53b9b59b---wepapinorufenoka.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/64974622592.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/29314489254.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac9bddf72---lugagol.pdfIn PDF document text
    • https://network-italia.it/file/rafuvoneboki.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/92015674294.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/jagutepebuteganojesipu.pdfIn PDF document text
    • https://petikdaun.com/contents/files/64675220502.pdfIn PDF document text
    • https://iwistw.com/upload/files/setabedazepisomewar.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/xolewoxumiselusu.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/xaregir.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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 17180 bytes
SHA-256: 91737704b3d4da3c54f11d12f8166a86cffe3ce4d06c7bdff0d5e01ca7d91a13
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 10616 bytes
SHA-256: 5b98d9cc63b40203e262db660cdb2db949fa1be8f9d1135a42d9487eae3b8956
font_02_sfnt_off00012a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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