Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1ef2759f5417c4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-22 15:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12504225aff21478d0d5020e551afe17 SHA-1: 63b6d529b0aa2d5bf56acef6f924eaa710ea418b SHA-256: ec1ef2759f5417c460181e9e65a1ae81498ba59626c573bfbeded3e66ac83773
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search results or distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=libro+ciencias+quimica+3+secundaria+editorial+castillo+pdf PDF link annotation
    • https://www.hippocratio.gr/ckfinder/userfiles/files/75187915696.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/40906664540.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/68189552088.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613356b36fb96---lutoronoturobaridu.pdfIn PDF document text
    • http://vladekoservis.ru/files/zonijepukonafakasipuvijew.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vujekame.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/nopukinezagujimix.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/64140199703.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jirikexopubozat.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/fokijisegagur.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/9629216846.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/nimepivisevi.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/78915631725.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/57585294260.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/8638865116.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/96405087241.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/23961190248.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/19068360774.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac978baf8---jipezox.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/goxekaxivamoruzaredafoz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d2b561fd5---xobufodolajot.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/30183206224.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/bipezumunifuzaga.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/33139845025.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_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 18064 bytes
SHA-256: 3910b350d978118be282e97032daed9a99c15e3723e696468a9263f08d060905
font_02_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 11296 bytes
SHA-256: 8c2b782553ed0520c2be43ca3c9c8402b62d95ca448b2c84f4c95dfbe1d61853

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