Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bfeeedcba35233…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 18:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a95eb7667b6df175e4cba922dca9a013 SHA-1: 634b87bd21865dd17e0b5ecd8c7c9ec6b0aa9f90 SHA-256: 98bfeeedcba35233cd986939617ddb529632793138cc4b30e94712915ed38e01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cructi.ru/uplcv?utm_term=deontological+approach+to+ethical+decision+making PDF link annotation
    • http://sdds.be/userfiles/file/59004267774.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3fa0221f---31372709929.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xojox.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/72801648404.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608249bcd4c95---pofuruzi.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/dinefu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d321424910f---38675274460.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021620231391421.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gotudikidosas.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975ccf9ef6b---wozitefitixoj.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gr5vudcik7suc40s3i8nnjor2b/33677840184.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5q0f7so1chphiem3gkeo7kcap4/24580142393.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6197897630---niparow.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e8439957---gaduwumufetibas.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/96812306998.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10c4010da---69698956208.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/ragexawubasupivex.pdfIn PDF document text
    • http://zxsolar.com/d/files/karozinozojir.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/112bbeeaa6e5ec317c86227a103f6a12/90409088357.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608940c15c060---64093569965.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ls0665hf8s07hik62nfjlsicm6/zopazuvujipa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65c308eaf---17381751655.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/32ad55e3f6409dc405b3a804836f2177/febikava.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c5161ae0a6b---37430014505.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/600gaoauo8oa90an9f2b5vl1q3/nivogajazelizuwafojeno.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/72812605259.pdfIn PDF document text
    • 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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 16128 bytes
SHA-256: 7d68facc8e1cf312b7f8c03bb5f59575e473cf5ef266c46a5f60e3eec994fa73
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 11052 bytes
SHA-256: 0a78eaf31191aec6ccdbdf5aad810bd1eab57d97e351835ba2b24ab5889d5473

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