Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9c0a0a1a313e8a…

MALICIOUS

PDF

91.2 KB Created: 2021-09-03 05:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 323a7ae11c1e69139f402688751c538e SHA-1: ade72a42df47b4864702271d5bec731ba802dc70 SHA-256: ed9c0a0a1a313e8ab2f0c66a513c6308dc57e0988e327624f386e6f067c47b92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further payloads or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/00f1422a593a5818bd7f298b64ed2e05/12511718987.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef699d0a1---bakevinobesitir.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/wibop.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70012e65b---45113434131.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/xidikawokaselun.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/linutidazabuxutaziv.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a73d655590d---9572522617.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/1083670653.pdfIn PDF document text
    • http://proxima-design.cz/files/file/jufuneroko.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/dokunarufonokepumarenat.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/89209112480.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/36692329172.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/392f32310742f9fec7bea0a42ecc56dc/29506205084.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/88734032176.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f8976dafde48a0d174d3fbaf88ce4188/46919764246.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6ee8799f---fopiwon.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2f06e635ba90dd84bdd00bf4abf671b7/tenezakixibuxa.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/xovivepegivitov.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/72270891600.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0k1v26hih40tnm875j1d1bf65h/benekaxosifuxakojut.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/41076990885.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/4672894577.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/34988348206.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/96932609119.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/84841021811.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/nuwidixule.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/940846o3d133umfmreboo29une/laruto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=compress+pdf+mac+blurryPDF 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_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 17884 bytes
SHA-256: 1aaf6c9a3789ffd91a2f3b940a54abed42bf12f34f6f6783bbd5a5f62477673d
font_01_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14615 10872 bytes
SHA-256: e9a8e25ed8c755ce0ddf5276e133c73fc1fe5187b49943e9f4e10344e1763326