Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e9cd3ab09595b6…

MALICIOUS

PDF

88.0 KB Created: 2021-07-05 19:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f54b58ad91b2c136beb34bd6c17e423a SHA-1: 2d7ccf023d36c1f7f78dc04127d6718b81abe685 SHA-256: f5e9cd3ab09595b6434239341732a4f999f660ba750fef5c5f3d5ffb975e600b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=when+you+deposit+a+check+do+you+have+to+sign+the+back PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8f2b24c9829096b385e59fa5185cf4f5/xezidegewowa.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0471511001619964698.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/50783448109.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/89788760759.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/safivasatuxunetawoboja.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/zujoza.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/dubokowagokuxuxoboxo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c61fb0abb9386a785ff066d861253686/kerovirab.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/93f54f50c033d78dc5867d2f5c9b1054/nuxudi.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e4d1b249c6578eee6adcedcac18d1f6d/jazotudesisexadidolam.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2db59d893---34220597190.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/fccf2de3bbf4fa41e663b2db89937965/vozokarotizovudinujub.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/68455713022.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/29939602227.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/33uo9u47qm68p865n8boeprke6/ponutukokedolarox.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083929f5ca82---biwapanu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c569fcdc20b---75230141249.pdfIn PDF document text
    • http://aa-nusd.jp/sezokumafenilikezutero.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i5ldcd8q51haiq75mcamrnr5t4/xularididetug.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/16841288143.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/4510681868.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/61761400452.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/katimulojuvirafizilaf.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/bfof3b05mcleauvur6gfef2sa0/32328072709.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c1a826b9---wudikezuwodet.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/63793f646a33efe9b173d069fb4bf978/95400962193.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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 17964 bytes
SHA-256: 2ac40d083f60a873674145a5bf6e48faa7a4142811af0ef13c14de0420989f82
font_01_sfnt_off00011e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5E 11152 bytes
SHA-256: 564a403550d6c2fb51c1baed808937c45fdd73ebb318de130e66c64ea23e8f7d
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.