Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ec7c856dc85bba…

MALICIOUS

PDF

77.5 KB Created: 2021-08-20 14:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4ddff6199993eebca1be3be818d13525 SHA-1: 307676bb8a06748cf246b7f7777ec70db4e96494 SHA-256: 79ec7c856dc85bbac69110ec9b7f57e4526da5c4bf6e03257c53e5cfc2cf583e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/90693128062.pdf In PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B26B00367D8.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf841c3b9---30782900948.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77228b216---21533523590.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096e36e254ef---vilijeb.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/14517432697.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/16213569493.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8d4bae684b40df81e18b666f8c86561c/nikidadiwozupujipepudaj.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/fujiwemod.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085159fc1659---46013309692.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/78927074767.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/972224c904b158a23d74ec17c33454be/weruzimugimus.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/jewetagixezemaja.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1a38cacc---68238517786.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c4b92f63b---62293905761.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/tasefima.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4fd789302a99591ec8d68415aa78dd3d/sumexirolalomubatub.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713fcd01fce---kekoxedajuvopuxor.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/73302728850.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1289cde18---kifatekan.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d35660fd---77143160678.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc8570d058---loxitipadulo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be705bf4c5---59019375182.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098401376270---bakuvigatev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ar+er+ir+verb+conjugationPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/441ff1591585ad290434d099c005066d/94003854244.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_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 17068 bytes
SHA-256: 02c436c071ea3961baab28d9d2becb7a0560e31dcc1930982d70ba693280c2d6
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 10608 bytes
SHA-256: 6cd2a458d5e9c3efa834cd55686c883f5cc6968f4a266a06125e78888a766bb6

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