Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dceec1be2216fb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 09:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecf8af7ad32a537661d272f720cff7e2 SHA-1: aabd79bc88b764180ac3faa459bbae1019ad5bc2 SHA-256: a2dceec1be2216fb06a7b1d3298ced0288b9a7b0f0224e2d997fb267a090f4af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0514bb8c---21699716142.pdf In PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/saxazogitugexufiloname.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/fuvawoxusavelokusixajudad.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/xebiwipagazuliwaku.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/naxakudajusomokosevi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7jlf9ngh4lncumtmoevhfi18f4/weritatowuf.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/kilufulesuwavage.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1a8fa1b264589ba667671953ede70c4e/67104210236.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/23778250694.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/dugabatazulefimug.pdfIn PDF document text
    • https://orangerun.re/photo/files/fagepeluwigizofolon.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/144302619.pdfIn PDF document text
    • http://wenxuezj.com/images/File/6879594529.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160705bd415e7d---ledesami.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/1731128566.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/fewezosixopizonezilugate.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c44f4e8e48d---80578321404.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/44951062965.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da52b7436fb---kejanok.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/64117079019.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dbe414c5e---58638403426.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/titimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dragon+mania+mod+apk+unlimited+gems+and+coinsPDF 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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 11048 bytes
SHA-256: 18bbdb147fbc185a502d193d4fde64ac57ad0c21a4093d91275ab6e5d5046114
font_02_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 15756 bytes
SHA-256: fb192482ed481e2b9eb1a9a8c3f1bf845f6f36550a5ad2a9de82b0754aec6f17

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