Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ae8597e3a453e0…

MALICIOUS

PDF

96.8 KB Created: 2021-09-04 13:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5cb66a79a5dad033547a57f8caffb9fc SHA-1: ac07f9b1c2bd9e79d2d7a6ea83fc8f0a5aa1433e SHA-256: a1ae8597e3a453e06e9d0c805f2d895942839d24e4052d84ee5e8f8776940f65
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vm5ltbuj2jlo374at4qoouvik8/60734792065.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/jblf695inin234emlrrfhjq3b1/vemedajuruvumakisajavumap.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/neburasatixotenaler.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/645725c5834469f992e1c696331861bf/dolijidufijipusubus.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/43907267789.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/49557379449.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/bovamidedadegor.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/32990456544.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210612_5F79F1E13E97F2B6.pdfIn PDF document text
    • http://derma-dts.de/files/file/toxixibizamugidete.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af94208a6bf---77575145947.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2baf8915748469ff9b9751ec102ea841/badaserafarezewofaruduno.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xesegixulapefunaw.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/juzapobimeweratukag.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/29799250050.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/makijebufixixizawobikifo.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/niwenog.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/v3l6bi8jkd578t76cud3v58fmb/21868593186.pdfIn PDF document text
    • http://sam-global.info/files/file/45226298899.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/38137055553.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/pegumisogivu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6or1q2orq04ucuj0gcvh13lbq5/599374649.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fb20825c9---47826180932.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/tepotubejunop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=diversity+in+organizations+pdfPDF 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_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B46 18968 bytes
SHA-256: b6319c217b1e593f986af0176ecae0273cdc8364a7ceb6ccffc1235eb2e81d83
font_02_sfnt_off00015c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C35 10868 bytes
SHA-256: 675295406a1307f82bef887f57ac622a3885862f88a3acbdb6ba12ac1b4a2b01