Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d97e8b96946524…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3fe157489da26dc61dc461641c5f865 SHA-1: 6dbc321aefc5c41a8d18107eb3e7e74d3e9d89ef SHA-256: f8d97e8b96946524d79430092a3302c3333e443a1925bb8b384914bb9de04dbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fs1g39791qi8ll124u2tu6uqpi/fitazo.pdf In PDF document text
    • http://ahrestygz.com/userfiles/files/20210902_115952.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/11723279079.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/nesobegugenupobepikolanif.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/36170344564.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/xopuzabomawasenimedo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613811cfb5311---15141600955.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/708a7593bda0085793769af2a3e0a4dd/ridevedoxorisebipoko.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/taduxakadigupalefazulav.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/27638319557.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/gofemala.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/wumidulub.pdfIn PDF document text
    • http://honghuibio.com/d/files/56785926897.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/josufatire.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/83281480987.pdfIn PDF document text
    • http://linza-market.ru/upload/files/64190278836.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/fumosapifegademunori.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/xafomojara.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/paxaje.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/5105734351.pdfIn PDF document text
    • http://chongros.com/userData/board/file/26264398559.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/d3l247vp9k6fec4d4hqota2jdh/powofilomug.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/mesuzadirisuxulonelode.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/36ea7442f6b082149411ac96a5713202/53260047378.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/luwajenalatifal.pdfIn PDF document text
    • http://gr-chem.com/upload/files/garotajurogabusezat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=first+derivative+test+calculatorPDF 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_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 17048 bytes
SHA-256: bbaf63c030d9eaa5c38f202140a0e9e3775ddb268e190d39cbc6af8fe77a0354
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10400 bytes
SHA-256: e51f8b10ac1db3100398a1e92982ccb87d59bead831b93f83ad0cae93ba63e93
font_02_sfnt_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1