Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d4376885d71096…

MALICIOUS

PDF

90.4 KB Created: 2021-09-06 16:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f273b551f22065944f406d81af3550bc SHA-1: 88888e925338761c2c82e0e27440aae5d4cb4c83 SHA-256: e4d4376885d71096c2bacf250d8ac3f0666110ad1dfab325f952b787a3ad4a9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://iuoshili.com/upload/users/files/41333542895.pdf In PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/26607967433.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xekuv.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bifemorufe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f4291a101c8b06378fa18aec9ed9022b/difovezupujirexevala.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/20441581407.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/63717311233.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/32085194465.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/zosujavesidifefugafut.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zebanatezuwax.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b410b08f5cf---pigulixinipasipijefut.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/45130232514.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/wefekulufu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/5262845872.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/61242292295.pdfIn PDF document text
    • http://yuha.be/_files/file/limemovitu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309dbd99d5---zofigiva.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/36508172765.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/12977284576.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c64f36adf3---mobizesipezovuniwelori.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/45116168074.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/filivuwafogofitiwo.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/xonilogipije.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96a0630263---15734221174.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/be8677f922a0a8946c74140035cf985c/putimalilujidubazaxepika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nike+half+marathon+training+schedule+pdfPDF 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_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 11236 bytes
SHA-256: 7cf3d52a59b2e307272ca2a82094fd5afeb67b8bf913c0b6e278de172e58e8cb
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17924 bytes
SHA-256: 50ef46593a57503404bb57ac6c65d8dcfe4505171a6784d3dc1a92d9a037ad7b
font_02_sfnt_off0001433e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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