Malicious PDF — malware analysis report

Static analysis result for SHA-256 4784337f13571f28…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 05:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8348617d736a6e550a9f665f8cc5ca2c SHA-1: 1daef151400e70468ee37b17e50c6fc7f82ce774 SHA-256: 4784337f13571f2828829344d49b4bdb3e5c0d1ab359b56984f668f4d7750783
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/175261fab6240f378654f99a97a27b1d/regefikux.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/i4uavd3a0ie89b3433398lt1c7/rixasobagobogegad.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/97418280607.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/zakakusifidagetewe.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/vebilowikelawipu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c192be7dee---sineg.pdfIn PDF document text
    • https://mytopics.it/uploads/file/vuladuketigipemanewawak.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294202ec96b---wodufukidulezitiburawaza.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/1053852908.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/96445910650.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3ea0bf6c3ec20377d574e3410ea0ac4e/xuzawaliv.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607732b0a101c---32295146954.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/nesaxobabivezinuxuvim.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e8564fbc7---1133997228.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/lepulilatizekixos.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9bqeqk633rko20jrcpfq6uq891/palalazisomevugalu.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/xolevaboxes.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/48obp82rertat58h0809s76na4/bavobubiwu.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32751d464---48224702245.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f41ee2e64f2068576ca80f1dfbff044d/51626071680.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608791326aa23---pixaduzalakomexo.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/12448422240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=passive+voice+all+tenses+structurePDF 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_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F7 10388 bytes
SHA-256: 2c7bf052eded431773327523e554fed3d380ce14eff72da3813876901b5ec23a
font_02_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 19160 bytes
SHA-256: 6dffa6f93b98b79f92391321ae34cd863d14fac1801beb345463d16c26185801

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