Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf6e6af2c6d9ce6…

MALICIOUS

PDF

84.3 KB Created: 2021-08-13 22:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 94047682adf20e73ba47d201673da3ac SHA-1: 95683dd011de157a9f737df1b26bbaf2316b9fa9 SHA-256: edf6e6af2c6d9ce6133731299e2d05009bb6de04faa455c52ecb559907398fdd
104 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, supported by heuristics identifying the PDF as a link farm on compromised or disposable hosting, likely for SEO poisoning or to host malicious content. The presence of a 'download button' lure further suggests a deceptive user interaction. While no scripts were directly extracted, the overall structure and URL patterns are consistent with a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=rumack+radiology+book+pdf+free+download PDF link annotation
    • http://hb1004.com/userData/board/file/jugozuta.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/zafor.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/rabawekozevo.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/78774911403.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/50447478358.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/acf8a9a0bd4fffcaa56d940ee6759319/jovefu.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rarutakibitareguvenaxi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d87bda065---sutokaramebowowor.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3c5189288fc2a6992ff1a53ab6cffd54/86422362843.pdfIn PDF document text
    • https://baongochoa.com/upload/file/35318709739.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33e33d71c---83184662229.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb63020de---14952100035.pdfIn PDF document text
    • https://motacademy.it/file/59711196226.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/suzivoli.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/lazopemo.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/76050084955.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/89633837881.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2779e0531f0edec70298444f4b9afa86/xufivelodi.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/mufanutonute.pdfIn PDF document text
    • http://moneymaker-gold.de/files/sipopilavegakola.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/gewuweberagatofuvuvada.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4277a19b5---51828409401.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/95142577847.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16086046376f0a---19125671541.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/20258858052.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17484 bytes
SHA-256: 05612ea5e1f648abdd6b003e75efb0ffe753fdef53bf48b397ff68d0372d4d24
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 11272 bytes
SHA-256: fb684c69df52d8436849f32e0ae028c43f999769f7c9a33bda2dc19e52b3d471
font_03_sfnt_off00013ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC8 1636 bytes
SHA-256: e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500

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