Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad9a4921680efdc…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 20:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68989be192473a2264d6622b634f4a70 SHA-1: ab14b1b6a9afdb43926bd72d31aed95b86470001 SHA-256: 2ad9a4921680efdc4d37cd0db4d88e941c0dfc1f257095924da123287f1ee86d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories. The URLs, such as 'inwebjor.ru/uplcv?utm_term=shadow+fight+2+level+99+hack', suggest a lure to download game-related content, likely to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, supporting the presence of malicious JavaScript and link farming techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://inwebjor.ru/uplcv?utm_term=shadow+fight+2+level+99+hack PDF link annotation
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe9112f44---91086749430.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130dcc487c6c---namoguzusuxizovetaxof.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/84614630348.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/79129111098.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/mokidevovifudipe.pdfIn PDF document text
    • http://nemochem.cn/upload/files/naxodepopapopi.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/zanifepudufilidasijirel.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/wadifelupuze.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/61326280781.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d4c8c61e009c088f0da874b845715286/kufugulifezuxafem.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/medetoma.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/74047895484.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/70842571020.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40340aa6f---wuvopunebulenuk.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6f7e5dc72515a034b3da10d672f65976/lujesatutetuzijamatokese.pdfIn PDF document text
    • https://linardi.ru/files/file/dukejakebuteliwivok.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/39615715887.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144482f32e48---ditunesoxosiposeti.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29c48da93---39586835255.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75874471609.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/85910796033.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/73522404017.pdfIn PDF document text
    • 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_off0000af59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF59 16396 bytes
SHA-256: 88a99179b2ec4fbf176d16a3f114dbfdef761ced44211dc981dddd4b7538799b
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 10988 bytes
SHA-256: 802577a53d0a14579580faa81c72632001a0f9b401a7732cb2cf3dcb67501f0a
font_02_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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