Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a09fd559c24d04…

MALICIOUS

PDF

90.3 KB Created: 2021-07-08 05:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eef081b42e005a5f1b80f7e1dc3a44d1 SHA-1: 9839f3dc6a79e58bd5057db6cf4b7ec45ffa574f SHA-256: d8a09fd559c24d043d38299937af0b9f6cc67dd513ba02a6999c3aff1bcb42b9
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing a browser extension or update, a common social engineering tactic. The numerous embedded URLs pointing to compromised CMS upload directories further support this, as they likely serve as download locations for malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • 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://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/0c2iv59ir0g2u9rn0029eo03s7/16142174736.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/90a5942fd9c56825597ebdc785ada17d/4624094597.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826997774e9---59912462482.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kamudozowukabilisewusilux.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094099e7a1f2---63169322322.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba85fad9133---45123892200.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d927ab4fc3---pamavijogeva.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b041fc29---59964331444.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/gukefadejabave.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3ciem7atc7aeq88t5h5sv1vib6/71448145688.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e16ad99eb7fcdab5a6595f17041b9578/12551740245.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0o3m5lj608k5d5ojfim6js637t/20708775588.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/abc66e8d4fd8149e1574aa6f6680ec11/85387649976.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8b26620ro08suuvq4ghggttva5/munudusafi.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/xukezol.pdfIn PDF document text
    • http://midel.me/userfiles/file/nisifetumoloj.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210630_634D83C38C2BFDC5.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/005ca64737cb30d8f152758ecd004a0c/35300513873.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/9815238433.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xotuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=arch+tempered+kulve+taroth+weaponsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/97c65246230bef6e70b8f314ea05d410/25120734824.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 18360 bytes
SHA-256: e4c232b4b697b82be7e0176e9917afbfaac77a895c7a33234bf3877cfeee9550
font_01_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 3360 bytes
SHA-256: 78e1dd199283e6621eb152e33a17fd2c9f3bb8b951f126dc8daeaea4039beeb6
font_02_sfnt_off000129d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141ED 11012 bytes
SHA-256: b2a8d512ae96de2afbd5325d98b1c247a54797158130e73145430356ef4c3981

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