Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbb731ee26d9765…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 16:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4aa37d01c7e2fac1ee539d3ec31bf607 SHA-1: 1b66a87920cb6bc5887d512b0714d906dd765235 SHA-256: 7bbb731ee26d9765edc200bd1c9b310e0ec2b95d1d0ffcfe3e74a3307015c858
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript is likely responsible for executing the malicious payload or initiating the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd63bbaa98---padusidowaximobav.pdf In PDF document text
    • http://crystaltrade.hu/data/file/6173872737.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/59162915991.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/fusideketawoperox.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202199235524421.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/836768668de0786e187beea4b2209cd4/32110811655.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/kikiwase.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/13129256055.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jesadu.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zagibetejijagewuzor.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149a2c18bf28---45682619227.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kenaxewugitoneriwatavev.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/60927291750.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/jazaviputeregegowaw.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/58818289601.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/86039733532.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/3772389223.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/tekolof.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f551b68e6dca1bc9f27b3badc710aa5b/29883678159.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149416f9a273---34520717400.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161508ccd1f0f4---90290547006.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/25139409370.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/90494779542.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/10531675098.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/5761804396.pdfIn PDF document text
    • http://vce34.ru/attachments/file/purulapinoronuv.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/ratodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=change+name+on+android+phonePDF 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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 10560 bytes
SHA-256: 38f7d25f4d7e81704191195179ac527d3ffbb0f777cc56d19f16d2de4a98a358
font_01_sfnt_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 15648 bytes
SHA-256: f91ab47efa121e1c8a45129877136062aa8068b67bb5f8019c3b43ac8f7381b2
font_02_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1