Malicious PDF — malware analysis report

Static analysis result for SHA-256 0759589f35583701…

MALICIOUS

PDF

68.8 KB Created: 2021-05-25 06:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 838ed44b8b6c6086995847c2517845eb SHA-1: 7489d6db6b55e39f621d1bdd690af846d3aa9607 SHA-256: 0759589f355837013345996f1b91ca2b6ad9e0cde67a728a0b6b767f3bb808b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The primary attack pattern involves luring users to download further malicious content via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=what+are+the+cigar+sizes
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceda0ca6b9---16309453742.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/jbiunpr5j4vsv0ans47175scnt/depojon.pdf
    • http://ipsgroupjjn.org/userfiles/file/19879475349.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e1bd565d---60546170461.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160878dc0e5c87---didodiwuzajazimirusit.pdf
    • http://www.look4job.gr/images/_user_na/file/73521361358.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c25f5ede0---76732107969.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabc26afee---fejeveditezo.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/c9h75sigo0d7fi6d95a5t1edcr/daposoviretamulano.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15a850068---xefebil.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/08c13f1f3cd38f4e33afb518af89fe11/39081924767.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pra0h7913m5d9e9t9bq7cimukd/21429971929.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a30485be08b---denusuvulemawobomam.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160715c3fcdf84---gasofab.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/99863a9955481030b0b357d3f5a00f3f/gerojivokiniguwasabode.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/zapusibifunigive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7f.bin
d76b9e9ef70e3e2a8c30dc561c9f95c6393d10271e89d9f1ba3f4274878cacbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 5092 bytes
font_01_sfnt_off0000e0e3.bin
8eccd71a67709bb106da1494f45b202735dc5d9472eb5b85cdd41a7f5651362d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10608 bytes

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