Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ed1eeae39a83a7…

MALICIOUS

PDF

85.9 KB Created: 2021-08-02 15:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2aa02d2043267de5b606ef2d5410a38e SHA-1: ed986dac8d2e8de4c8bae7539fe7f9e1a497401e SHA-256: d2ed1eeae39a83a72f0c0afc3506d29d0c2076e057da9ed8ae5944c8ddb2edf8
96 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to multiple compromised websites. These sites appear to host further malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier strongly flagged this sample as malicious, suggesting a high likelihood of it being part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=growtopia+macro+download PDF link annotation
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/21339921283.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15d2a612e---luwuvane.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160941d52be092---30598668741.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9282dffa6---49356586585.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/lojibu.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kiwekaxowomajiguti.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bo45o2dbr240jajib4mnocih43/bewujuf.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0652a097f---45888673135.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d0c5659c5---71774186859.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b344bf4325a---gotubodarituli.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pegutemaretamifitoguzek.pdfIn PDF document text
    • https://onlinendttraining.net/files/vuvurivakavo.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/37339815374.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/o5uvnfp1uarlj5n9mc6msp1j66/lugaxoxogozuwodunafive.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e003874d6edf9d00a2f754a6034ccff9/memox.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105b563eb465---90102863746.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0aeb2f9c---22719720856.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8bsc5eatc6n7gr5fsuq89lnc42/sowovojurabuf.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/73bcdd426d768d2db071fac08532e0dc/21938661437.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/mejodotoxagoxafomepewel.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9cf8c07e---resenunisorirudizomene.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae96d1132cf---kumiw.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vaxer.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873c144b377---jegizudagebepok.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16524 bytes
SHA-256: 152d05187ea47df9a84047e4b8e5bee231f68bcbdead31a61a4e65d18462a682
font_01_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 10500 bytes
SHA-256: 1131e2c6ff607b5d0d47847a9e867073860aa0e8a07595948dec70e1aa32d7f4

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