Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfe234c3eaef4b2…

MALICIOUS

PDF

85.2 KB Created: 2021-06-13 16:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b6a5ea0fd9160c213cbe0d9b1d22b5c0 SHA-1: 94766f179504fee6718f64e459c31792bb332683 SHA-256: fcfe234c3eaef4b23b44c7d5f680fccf2dd6973efa83698acf36357b69d4080b
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://nomylo.ru/uplcv?utm_term=baby+ko+si+kulot+download+song PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/24058677506.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f839f3259---vanepunasi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab204c6a74ee00a93984cf208a21f51c/46435938074.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee72cae92f---fireforolazefibop.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/461eafd57819f7191304d3882c76e085/kijupero.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/jorofewevezopotomu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6cb608e6e8c66aaacf6df64c202a6b78/61796984434.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/jimebelikalerudirinax.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/tisogetopexetejegu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f9ef94f---18732880246.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da34562565---52989371526.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072ba5e2d95c---22636043760.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca758197e6---rorijubijot.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/mediwexemazilaxevisikuri.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2570b2659---46744839243.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/93813740554.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tutebofik.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/refovuseranewivane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 5108 bytes
SHA-256: d63430d3df9d28e3576724627d58302a4f1e8bd5193ff0af943518d4d65db9e5
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 2460 bytes
SHA-256: 49e37842857912ce1cf4e048cb8a9214d638de3b8fa7cac426bbaadfb9236b93
font_02_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 13116 bytes
SHA-256: 0c77158694627c218b211c7bae8a372039792c38c13593e24664faa2495863af
font_03_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 17080 bytes
SHA-256: bf61eb9f4212a837948d525f8edda98b0e5658621ab1f61a2949eaeef72a77b0
font_04_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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