Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b66a7df969c5c8b…

MALICIOUS

PDF

77.9 KB Created: 2021-06-28 16:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1da16c14264deab4e269f096ea06cc7 SHA-1: 89df5c421da5313295457f253fef4d9c35ccfa36 SHA-256: 2b66a7df969c5c8b7440bb48100853a6b5e1abb89348e59840f9cdf5925d4e6c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and the structure of the document suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://haysalon.com/public_html/userfiles/file/40631912971.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d8a10cd3---sazasaletiniwogajakeb.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2ef2bec94f34cb43381d9dd87549ac19/14011160739.pdf
    • http://kompletucetnictvi.cz/files/file/58565242710.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a3550a5eb48---xeduvazimiwonasejeno.pdf
    • https://kis-u.com/page_data/file/20210605095241.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nh2i1v9hsh1ip4100qd31f2ur1/5046065880.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1685353a62c977a69e58d1e978b8d233/93473032306.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c584b4fed---doxaxilet.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6np827sluecvusr522esd8p0bs/bodusog.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aed50afe28---15533440035.pdf
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/pepefezafudikan.pdf
    • https://giolog.biz/images/bulk_images/files/5241428150.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f662cd3f---65386707288.pdf
    • http://autodilykanka.cz/cmsimple/images/file/janumavipopufibatasuse.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6eaaf2f---wusup.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c63bbba00---xedurineza.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab2c2ce5c7---62531941606.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085227a05bc3---14604161876.pdf
    • http://candemdientu.com/Images_upload/files/lenaki.pdf
    • https://wecareu.net/ckfinder/userfiles/files/najaxomoziwub.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2jas41addbm2felakej71n5q8k/futujowowazema.pdf
    • https://autotrans911.com/thread/admin/uploads/file/71969388654.pdf
    • http://www.annaleehuber.com/content_files/file/lunexopanerako.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mcqs+on+noise+pollution
    • 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_off0000cdef.bin
67599c26e6e44803ac53a0da0082bd3ab68dcf74d6f78de57fd5259b6d05c738
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 10344 bytes
font_01_sfnt_off0000e563.bin
7dcd80a7efd691a6f1d0362ed8d2348d40e5c6ad560a6335e34c0499a6778219
pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 17252 bytes
font_02_sfnt_off0001129a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 16792 bytes