Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be422c7d5f98217…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac17cd79e9efdcb29c68dfe3a589712e SHA-1: 36e011770e17d4487b6108194cd0f416b588aa2b SHA-256: 2be422c7d5f98217cde125fc63143ef44877d94d28298962473ca96f981a9b12
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate links to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The embedded URLs are likely used to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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.
  • 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://huntic.ru/uplcv?utm_term=meaning+of+cervical+pain
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898411b3873---desugozogibepebenu.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/glhj1ipv3ln7to77k86q4k0qv1/rakibofatubotanuvovova.pdf
    • https://pima-alarms.rs/slicice/file/63234501977.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba324dd5d65---72424516217.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/b2b395efbcc7802285d032bd7e1dafca/78497864669.pdf
    • http://ipllaser.in/uploads/wemodit.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/78lbg3m4u520o6osck7a9ulec5/25200136087.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/t1e35bg5kff65u8koa6nisoa43/zisoliwulape.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbb7be3529---faxulinu.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/tnlss5puf48j0obq6seekft7r6/33635770717.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f2ae941600726f5e0e3aa78a0864097c/64555760200.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a679828e5---33890523138.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077464a869e8---paxitarigov.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bdae191d0---pubume.pdf
    • http://texmet.pl/userimages/file/somivakiduzu.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a725822d8f---97572431575.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4accd068---79011415450.pdf
    • https://intrigantka.ru/images/userfiles/file/sagixemunujapigel.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/2572a0db4ed75fa5ee705b55b8194324/notezenirajapenibeme.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/399ee0768b1677b847fb0577f47c7bf3/5903180707.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec61d1cc8---44151694238.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607488317cb20---69085641775.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2bdehk830oclong6oko60mvi81/jejizunetuzozitur.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1af6ee1b8---45636222285.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ac78b377---zisajidavoji.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_off0000e96a.bin
9053451bd1ca5d392f8b70e934d13825bebe413d9fc2073a6bfa239c4258091d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 16328 bytes
font_01_sfnt_off0001139c.bin
836624ae02f4c1099590e11f3736c28ed9998ae4574b5c68a04b18d8aa3cd133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 10448 bytes
font_02_sfnt_off00012b6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 16792 bytes

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