Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbaa62e01f390e8…

MALICIOUS

PDF

100.7 KB Created: 2021-06-27 19:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45827964fbc386ce7fe23a62b346daea SHA-1: 0d54c38c39efd3300f96b6e465bd23050b2a168c SHA-256: 4fbaa62e01f390e8e74e518b159e4e2d758e9d95823b442592e95e89b9ffeebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns, likely leveraging spearphishing attachments as the initial access vector. No scripts were extracted, but the overall pattern points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=pulled+muscle+in+thigh
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/funewadewizuwidinil.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47864cbff---25124641826.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/81321085625.pdf
    • https://ladangmimpi.com/contents//files/71798928578.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/378c3b53f519b2b1f9412e094dc02d1c/99384974678.pdf
    • http://ehoron21.mn/uploads/files/59984908896.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7f00e0a00---27144952223.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090f51eb8e32---wegaditi.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160790fe9e307a---37177910452.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/64dca02bcc599dfd0d9acda8e7e1e5a6/27145003418.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/39ht3fd2ca8gtafaqcqch55o02/33892092404.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ad32aa215---7396589757.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16c0cee06---makimutufusojokimo.pdf
    • http://fatamorgana.fr/uploads/assets/file/35566373223.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ba0b15d8---17295662909.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/6bf00afd4350c3bf69a24d1e7b5a082b/79830352466.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/ef0d24db0526c791fa8b2ed822d96ae0/49066979428.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b6856098aace40a3f9bea6cb91af2c48/tekilofexev.pdf
    • http://wecans.net/_UploadFile/Images/file/kegiwetetepaluviguf.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/63ef09ed80aac52015892713cd2c8981/vafib.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a076fd6277028e764ebbe37f98623cb0/zatewipolatijo.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/55720531988.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a06ed9410---mipupugikuwewax.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/sivm3nkifp10keev4bfv17dp17/tusedelulajujasopezut.pdf
    • http://szpk.hu/_user/file/zogavewikolud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129ef.bin
4554bd47c3f6762c3287a925b8fd0b674549d9bc61ac2f9cec6d40c34dbe9ec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 16912 bytes
font_01_sfnt_off00015623.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15623 16792 bytes
font_02_sfnt_off00016e3a.bin
3fbb3814872f27f44c130021906928ae3bbd614ccbd74045238c5446999d7f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3A 10536 bytes

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