Malicious PDF — malware analysis report

Static analysis result for SHA-256 22625e6bd1bb835d…

MALICIOUS

PDF

72.4 KB Created: 2021-08-28 00:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22ea73d94f719fa308c6d40814fc8161 SHA-1: 68f3fc20a19d9437be3f8bcea4ead01cbd2a3492 SHA-256: 22625e6bd1bb835d5c1fbc743d82d9680eb3384c752e865aef9899f51fbac54f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress upload directories, suggesting a phishing or credential harvesting campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://philabc.ru/uplcv?utm_term=voluntary+death+and+dismemberment+insurance PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47c3bd445---nanusedopawepidosepoker.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/81268794881.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f30b56748---12507870818.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/20890056037.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/pidetabem.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/83168551302.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/35008300118.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3863143a---vusajoverisiso.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/28707950993.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095e950eafc5---19216214372.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/20411046038.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/20438353724.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/pozemowebuxubolojuxew.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f42b2d6f7ed65ec7845e4587c6c9197d/kebir.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210804003021.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7bf5a0538c434dc8dfb55511f8868fab/32303946498.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/vonaramadexavuza.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/22365264110.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/kotowufanilobuw.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a2a0b222a---nadewud.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/merupuvufilow.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/xusufutemulugibovazowokak.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/givolugakodosifafigixori.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/kufapuvonubonotikibabuza.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9c804c7bcaa5d8bd47b14156d9e64266/96258981377.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bca58dadab76b2b7d2931f5f77a10ec7/95654506418.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cb6ae50e6f61c7cc8a6d10912f7f57fa/94389264777.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_off0000bb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB51 10956 bytes
SHA-256: c41f6fc2cfcfc0a8c57ff0d588e039c96c9118b161987bae3ace2fa18c6ada0f
font_01_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 15292 bytes
SHA-256: 2c97b1804cc43fc170d79f029a643cad54bdfc2246a4c687b5ec9f772302c2f3
font_02_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1