Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a74df37908dc7a…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 01:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0aa5968e25724c8e6fd23efab376c76d SHA-1: 4ba39f9bfd877cefb9984e45c18ba0096e1974a5 SHA-256: 23a74df37908dc7a9195cf6e8dc74e31c9afe63fd9b98cf443e52f8230459646
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware distribution lure. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://fgosvo.ru/files/files/motejawa.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/87584877473.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ced5aa17---73203929450.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/2537m4rgfn0ekq0b05tff0l52i/11199506555.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/jogiwudobubu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcde688909---10772160214.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/larixonimem.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c1162055b---23039434043.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/kizuvodokugusarexidamani.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/nijusaz.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/bdfc0c422d384b9164dd2f139cc98022/40738139328.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tipopopaxa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/fudugegopidapitokeger.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/1792702544.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ba740c59826---bedabefirelakapalu.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/91976885398.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/kokepatit.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/firulisejivesin.pdfIn PDF document text
    • http://khocabien.com/uploads/files/ralowub.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/74952939200.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/kokebed.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ecfd6ffff---84110198485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=daily+words+used+in+speaking+english+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_off0000c03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 16828 bytes
SHA-256: 64bd7b28cbdef956179c262ca58a08c4bc79232767eab7deb0df69c1d1c4be4b
font_02_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 11072 bytes
SHA-256: 542afaff6d2931c9a83a66e431d7616ddb41ebb35dc2c1b0068a6ee79d6cd77a

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