Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2fc7b6900886d3…

MALICIOUS

PDF

94.9 KB Created: 2021-09-03 16:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6313f1af068c89c562655e8456a03e33 SHA-1: 3da0decce68d9b199ade60012ed80cd39acd3fa3 SHA-256: 0e2fc7b6900886d3798d21f5f324f7e3cfaf215fea215320f9a2c72e9a8896f5
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=ludzie+bezdomni+pdf+wolne+lektury PDF link annotation
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31946554208.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b772cf6---37670807370.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xijefanikowapemuvabevo.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/vomakulameni.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/an7gk6gcq7bicog2o7tcsd86sh/vagakadijewopes.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d372bb3e3---sutojajujonovipupusedav.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/73384200715.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f4a1e47d500d2e21089e9db066be669f/memajazet.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/mekopijivum.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/lodilad.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/23348061529.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/9k5ncr25gd06up1gs824ajj010/11511911409.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/108bfac253385fa26986ad657487a44f/xeriwesuvalix.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bfs1vjpnuokp7m96kn218cjt31/14505028803.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e003874d6edf9d00a2f754a6034ccff9/memox.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/06lujqvv569vu7ij4qp9j54nf6/2392880159.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/88026652806.pdfIn PDF document text
    • https://securitydm.com/slicice/file/lekonetewaz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/uqrs9ivep1n7br8vbsarjknj21/1955372426.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63dfd76cc3---64449234629.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c9f4cddffd1f446aa7aa35cc879364bb/14538615261.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/19956755403.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_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 10880 bytes
SHA-256: ec8bf8efdd69901133098e328d9f522c08a3da3758f1045954f9962ea0a534c8
font_01_sfnt_off000127b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B3 18696 bytes
SHA-256: b4829281a2f8ac9acceb2b7d3c8e59a74bea0c9e95b21f1a8ef440b88a6bd732
font_02_sfnt_off00015613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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