Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ed0e7e4d509b99…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 11:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef5c8806cdf27792767cf7cefc10916a SHA-1: efd0e20d398bb8db5ed9e6746c8384feb2d5fc22 SHA-256: 88ed0e7e4d509b99c69a41a3e8a1a2a008355adcd007e6d07683c13f69879407
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms hosted on compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 http://veivel.com/userfiles/file/basagamewejokawinilifozi.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/rpcjqdivna0sccg51p0csr2uv7/tafusugulotasometu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/serunonanepuxesino.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1c885b5bb886544c24052ead6c95f04/mutulidujekade.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/nobutoparuluzajatam.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/73181729582.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/digejutotawanaxugagudisam.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/12451858600.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a736537ad---84274834295.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/97889306716.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/464bb823bfb4396ff6e9f5c99113d099/lelusitudela.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kabapukakudo.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/ramutunokudom.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42650482e2e57c94dc8ff9df85672f26/fawofudolinajurit.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dcfb7c459---takesojopafawawekabaxav.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/27258118824.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/jopeledosiwajevozenigimon.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bdcea84f---52721722911.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db72abb00fa---1466323192.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n77qu7i4f45noda9m1tiqd82vs/famurafupifovevojovetoba.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f261asc3h288gialed4eqorhtg/20584618951.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/21735662037.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5ic9kv9pug6i36l4jllmlrnqjd/60573684145.pdfIn PDF document text
    • http://beateromer.com/bilder/file/45831793021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tech+mahindra+company+profile+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_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 10696 bytes
SHA-256: 9455f41c2d4a56e861cfbcbbf6f6d6657245a8ba570c1729f048b4e2a9b67e06
font_02_sfnt_off00011a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A59 18508 bytes
SHA-256: c55fb85d2c9c3e65761e499ff9f99b08b2e23383d2e83c6a24374c4fc66e1760

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