Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03603d469c9aafd…

MALICIOUS

PDF

96.9 KB Created: 2021-09-19 09:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f2be7b45aa70af692956c41dc389bcb SHA-1: 6adf8fb2abff2c1a7a163c5ffe35e4741ac4f8c5 SHA-256: d03603d469c9aafd2caed71c98b528e1482aa283f7abf106b5de5fbf51e912c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous links to compromised websites, including those hosted on disposable domains and WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dsacare.com/admin/uploads/file/81567817155.pdf In PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/gabikudosojixizovaz.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161423f4b75a8c---rupomage.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/sifovoxijamokajogoki.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/wowabiwuwupasisajaxegum.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9f5e501795196bfdf3926c40f17243b1/67970586989.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210910_51BA7454FD96ABFA.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2e32803f---82143234329.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/6017886465.pdfIn PDF document text
    • http://panova-art.com/files/file/2752711474.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/ruxobozofakonavod.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d8c3073a---13869070591.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/92779332599.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/ganorijabuk.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/23749914280.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fenibimo.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210917210839.pdfIn PDF document text
    • http://standardamulet.com/files/files/7835653578.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613718ed2ad63---welakifujizasamorifid.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/nekivek.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/50243616886.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d4e34b31---51687197058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chal+mera+putt+2+tamilrockersPDF 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_off00011220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 10880 bytes
SHA-256: 25c94caea85a5141a7426deb507c6a8453476ddd3f32b5a7ab1f1ea86dd1c3b6
font_02_sfnt_off0001436f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436F 19192 bytes
SHA-256: 509911ffae31dbab66a31a1edbe87151d8e26af32da9bba8371bc46a3e26220b