Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24249b0c9074e81…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 14:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 352b1680ac264d4c9d6f4a19286dc2cc SHA-1: 0d4fa89351a99eac92b1e9c0a144fd9a361e7ae1 SHA-256: c24249b0c9074e8136a28c34043635d6ab9a79a3d230e3e4ba2271b367f74431
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or payload distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://medvor.ru/uplcv?utm_term=plant+physiology+and+development+5th+edition+pdf+free+download PDF link annotation
    • https://magnettoptan.com/upload/ckfinder/files/gupok.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/70422221758.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/geterobisijovugobomedovoj.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/51887520454.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4ec907334---19750969085.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/95411194785.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/71329299790.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/72eea70b185850fe654f6993c7d19164/41094762799.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2ebc41ea994c8c48af7ec1d2968df51d/73831953081.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/58942566231.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb0e5f30---bukeribosaroduwupukokizub.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/nanulumexibulot.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/jaram.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/41288882065.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/83834408096.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f7a4f716c4e84e917dc84055c7df86e/gapabud.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/1324937811.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210815054557.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869e79103dd---valomovol.pdfIn PDF document text
    • http://edituj.cz/res/file/wudajono.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be298657f---7027590588.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4b864dac4ad3298b0cb479a7845fd6c2/kepisaxupewifanoji.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/18400276090.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ab8ddecfbe131a7bc1af1ae7af442ff7/rivotatujuzuwulafasa.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/94991852678.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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 17088 bytes
SHA-256: 03d302dfc4699fb5221ffb03b14f42bf2a6b817744c546a7b31b9f777cdc460f
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 11348 bytes
SHA-256: 94caad36e13d271291d9af6675ce7e5b5c7f09bc1bfb05d243706519cb98a09b