Malicious PDF — malware analysis report

Static analysis result for SHA-256 4848ea588633d524…

MALICIOUS

PDF

90.5 KB Created: 2021-09-15 11:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d50b1c56907f65e9487f518dd2f7e80 SHA-1: 49c9e8e753fd86d1a179d3fcc0fe05b33e06f038 SHA-256: 4848ea588633d5245c6c3d855ed3f423ff7e108e3f12c54256c83ab18985386b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's a link farm pointing to potentially compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • 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://ghnservizi.com/file/rinebas.pdf In PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zokovixofutuga.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-10/20210910120944556742.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/93155113694.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/titokinebiren.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/72087824761.pdfIn PDF document text
    • http://naviway.su/upload/files/24754490612.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/besediwulaganoraxulesi.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/noxarolasadoveximono.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/806b6fa55ba787a76d0cfec5a5198de7/23167235440.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/tajizolebamosi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/miwaj.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/wetukalomuloruluwiba.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7a975omi1h84efu28pdssra5rm/mutazewumelarazifajuxi.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/64362362639.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/suvobenikivogokelomudalok.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/31637852649.pdfIn PDF document text
    • https://ibextrail.com/editor-images/59510344362.pdfIn PDF document text
    • http://thepducphat.com/upload/files/sixawixamibegaxujetix.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/sagadisilusasabarepug.pdfIn PDF document text
    • https://basisangka.com/contents/files/75917360893.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16133abc35cca8---zefelukirexarukuvawaze.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/18279631423.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/62699185659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=my+live+net+tvPDF 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_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 17588 bytes
SHA-256: ead221f5c48928d8230694b5741872de25e6382645be688bdd82aa70ba08f62a
font_01_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 9724 bytes
SHA-256: dadf21ee57fb13ad1cf20f388f3b1becc5312cfdb396f50b1d1f7d578b77d575
font_02_sfnt_off000144be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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