Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d50fd2578b9d39…

MALICIOUS

PDF

74.9 KB Created: 2021-09-30 17:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b1d6b3d0573e7bb6f37b8b5e1840f7c2 SHA-1: 4c4a08925b83306b2f90659054a2a4384fd0123e SHA-256: b0d50fd2578b9d391e9d6edf6b10377a290814a4b71c22e356d5b7920ba22ff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=card+sme+bank+konek2card+apk PDF link annotation
    • http://geometramaurotozzi.it/userfiles/files/70237810450.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109021409044111.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/muwinusemep.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/70929637993.pdfIn PDF document text
    • http://ridendo.cz/files/file/nanojowuma.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/muleruzivatepa.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c91304963c579be9f10542ed3cad6331/xolosoxa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614484fc57b4f---bogat.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/50662166795.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/wuzuxugusoxorop.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/33112777316.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/8222319263.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a2989b3aff875a1f111fd3f4f3ea3086/pinokabosorezo.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kasivizabitogekiba.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152c9e6b6b35---31969534578.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/12235601873.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/76207510845.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/nuguxalirukesusurema.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109091757452177.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/27733888356.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/11723901699.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa2893b1ce---56684301479.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/tugagikobefawewu.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_off0000b93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 19408 bytes
SHA-256: 23959a8c93bb03d078579bab55753263ea7b6cf08aa4514a9999036fc2bac931
font_02_sfnt_off000103d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 10824 bytes
SHA-256: 4475a4156149bbaf69accb7b879fc5559f1f3719455a54e930aa4cb19c0489d4