Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95de9cc7e6f3f6c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 03:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d310fa84281f7bcc07c8771078520c8 SHA-1: 9ec116b95b167c9219123b907d55807e89788ac8 SHA-256: e95de9cc7e6f3f6c25087f7490a902973ec74aef4fab68c978521c2109bc255d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing numerous links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c782e4d92c4---kolulitapofovipa.pdf In PDF document text
    • http://goang-hann.com/uploads/files/202108231806201682.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4639ae0b4---75741262925.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bcc960f8---79200075759.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/vivoba.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zegofaputorinowaraj.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/narumo.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c14b91d37---lusowigasuka.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/58892826917.pdfIn PDF document text
    • https://buka.ru/sadm_files/61551474929.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/kejemivodukupofixi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/guzasarirutavo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/50e567cad5e2c69fe042c8c7562cb17f/sivipesit.pdfIn PDF document text
    • http://warehousetraining.ie/images/64875570044.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/98925420756.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cc62747f353---35017730729.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070be3ce9164---linurosoxijajogigujarel.pdfIn PDF document text
    • http://abnicum.ru/files/file/kizekidez.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/serazin.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a38f58d34---rujefuresuzajesewugu.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/db343ebee64faa2e4c02ba5da86ccba9/8368854717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+like+sex+againPDF link annotation
    • 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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 10452 bytes
SHA-256: 2f03ff07a61caef53299446fb3a9db4215525fe47badc8b031f10582a4015390
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 17256 bytes
SHA-256: 33ee0364c09e3ff1ae054851cbd47c0d901206d67ff7a9ccb66e1889dffc5775

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