Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afa0f6526d2b1f7…

MALICIOUS

PDF

95.0 KB Created: 2021-08-18 13:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ea29bd4fbfda0b39eef476e5cbaae1f SHA-1: 02e21e1028a623e6b4585101a10018b7aca23d28 SHA-256: 5afa0f6526d2b1f77e51a7c442cd4b955b1b6cd383ae80b68bc639f0ac3b3b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of embedded URLs and the overall structure indicate a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=copper+iud+google+scholar PDF link annotation
    • https://ebooksweb.net/files/file/47834200719.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gmfiv7o1c8gokollq1jneoq6nu/80365484250.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b41575aa844---doturomenojen.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/3867497991.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefc55aebf---petamafinixe.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/92603885686.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210512/file/5702949700.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/83353553985.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/9800196718.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/vogunu.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/6526947692.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/xebuvubegupijopuwe.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/woragubiduvowudav.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bf3ccea3f5c25253cd4a09865dcd3839/zobovizeropaxujisumivo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3847b5668af4db1ad3880d4ae61b7cd7/26190481292.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/68606457688.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607066ad142aa---13028733021.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609617201fb5a---97070240547.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/wexoxojefajuvokote.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0074578c7---31038706792.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4576901bdc---tipadofabewifi.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/fokipa.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/59023584837.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161171581f3db0---jupomixabobawobavemaw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/hqjfo719lgupkmlncmqqs0viud/83525122699.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_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 17736 bytes
SHA-256: 7ccff521cef07ee2a4888f771201c2e4e688990784800b15a812abe54ff62508
font_01_sfnt_off00013d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15548 10724 bytes
SHA-256: 4e3b1df3a49d0d7a2d2eab8baee78103ca9bb00403ffae968654b1db519a03a0