Malicious PDF — malware analysis report

Static analysis result for SHA-256 f493366026d3b6b9…

MALICIOUS

PDF

232.4 KB Created: 2021-07-04 15:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b5347522b8b034723342c5716966929f SHA-1: f00045ab946fec9e3afbe3140cadf280a6b664fc SHA-256: f493366026d3b6b9c139394c092155da830cbf4c1392a8acd5d87a53ad38603e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/uuflm8u9cj3l74jp7934bqjpk1/23564156674.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a67132ad89e72d3864f3c239d79e5277/73579858955.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/zalizatitunesazuvajijoliz.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc16de82ab---vowekubululolizixufu.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/7352dbb3d5f0b2f1f54bdac9b0c245fd/zotekupiwomuzenunijinevik.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/445d0279bcbfa19659ebfe668083c737/43520701222.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/r2lvjbdritab4b4uo62m2tmhna/22377847447.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/tofapuzizepubevoxigebikuv.pdfIn PDF document text
    • https://master-service.ro/images/file/bagazek.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/33310263896.pdfIn PDF document text
    • https://chpcentre.com/files/file/9965725212.pdfIn PDF document text
    • http://armanetti.com/images/samodi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sflsjrie51st8k4jn17tmv40ai/sokole.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/5953560426.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/nesevirafebimoraliju.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd76346122---toxoletudipumefunusa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d871b8ce30---kemaxuzinugalusorisi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9e63aa3b---gegufutilupatenogix.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1abbcbfcbd---11500463662.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/68af5e0024f55155ce3ffe4fc3f1e095/89034795693.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c1ad50ca---favufalolujekilamado.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b92aca7d591---61770769876.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aade824f08a---jerusivuvotikagevegoxuvuf.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/31839174532.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bfee567fe70a4a3609dc2e8108721ea5/85445545110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=linguistic+theory+of+language+acquisitionPDF 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_off0003300d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3300D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003481f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3481F 19116 bytes
SHA-256: 843816d9db709ef9eebb8ac984db68c08473230550d7cc1b0253aaff4ccb680f
font_02_sfnt_off00037a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37A22 10932 bytes
SHA-256: 8b1c8bb7422e475651d78d7c5578195f17dddf24d462619da42dd634d34a6fdb