Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd990e02bf8187c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 10:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74614799b9134ffe47db12c6ceea8223 SHA-1: 5d4abe44d46a92fe9816a2efffee653d6c394342 SHA-256: fdd990e02bf8187cb2c88359f6a294165768f287cda4a35872a41a0ace36670b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it's used to redirect users to phishing sites or download further malicious content. The primary attack pattern involves leveraging these links to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=american+mathematical+society+books PDF link annotation
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/39363167153.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6e0514ab709bae2710559b25b1ba1176/toloretapokeduruwonaxexuw.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/saredex.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbaef353d---luselisalavutaxuravi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8028954029---98769500445.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cd791b1b970---95982464769.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d5f9471fd33448ca46edd127ab8ab248/ragisuvafexi.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/7b628192679b776041e474e9b6e42680/tevogan.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/66012228797.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/11725656583.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576fe7c07a---babiwove.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875c5e9b946---75375323755.pdfIn PDF document text
    • https://krusomying.com/data/file/pupotelamagukove.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/5640315062.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed744f93a1b---rataxil.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c438e2525---54312220367.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc8e89d31---23792954369.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/nofivewajilelene.pdfIn PDF document text
    • http://retailcop.ca/files/desur.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/ribibedas.pdfIn PDF document text
    • http://vhktn.at/images/content/files/80719224103.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097495ddd482---61221235976.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf29ec5e5---93615218449.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d62fa766d5263f2647ca070fb6f6b122/veletivib.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_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 17836 bytes
SHA-256: bd867016798d5f7fd3b272643be629e50711a61d29671c5edd9c3de156ce984f
font_01_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 10824 bytes
SHA-256: 2a9bad0d68e7799bf212e45e8f7105fe8e510233906447ab320e225c3d8f3985
font_02_sfnt_off00013055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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