Malicious PDF — malware analysis report

Static analysis result for SHA-256 67eef3027aa2a441…

MALICIOUS

PDF

91.2 KB Created: 2021-10-07 00:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6ebd5068fed479e16526e08bc9ca7da2 SHA-1: 880cf0a07a55295f9fff67bc85f172edd5ab6ef5 SHA-256: 67eef3027aa2a4412d69957cf413f8f311193a6afa7392e863c2044e389e3c3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress upload directories or disposable hosting. One heuristic specifically identifies it as a 'PDF_SEO_DISPOSABLE_LINK_FARM'. The presence of an embedded JavaScript stream suggests potential for further malicious actions, such as redirection or exploitation, although the script's exact function is not detailed in the provided evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wastran.ru/uplcv?utm_term=the+answer+to+how+is+yes PDF link annotation
    • http://we2meeting.com/ckfinder/userfiles/publics/files/pononu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f084b0fa1eaa586e682f1454be815f4c/mududes.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907064540.pdfIn PDF document text
    • http://bdnchem.com/upload/files/rijenivirusokugi.pdfIn PDF document text
    • http://air-ned.com/uploads/files/xupewamuzafinejikada.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632874661.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/mesibupekazetediripeboke.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/pimuj.pdfIn PDF document text
    • https://petikdaun.com/contents/files/5460086875.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a264bbd602---35657184283.pdfIn PDF document text
    • http://proxima-design.cz/files/file/vavup.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/titisipafujerutemotalira.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a10a3a3a47648aca01c902062ca9a4fd/lovokizakejix.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73247152420.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/lasesifinowexe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aeced9467---vinodejavuwenax.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/59b75349056094f03b6998bc44a629c7/bazorutezibalafi.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/38041172400.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2cf4lpgllphdn6ojf6j0q3eru3/23965210849.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/19037784086.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/38611286459.pdfIn PDF document text
    • http://imoroz.by/upload/file/58393257503.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/lelaxevutuzix.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/27883381976.pdfIn PDF document text
    • http://chanassociation.org/uploads/file/29465222752.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a43f0dac---18523318698.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_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10324 bytes
SHA-256: d08237e6763d2f578b225ad1b4a0250dc73c3077841ff7c542ea77a5974e703f
font_01_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F3 21344 bytes
SHA-256: f643457a71f2585654838f1efcbb1af2ef1a5744238431e358790dde0f96c99d

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