Malicious PDF — malware analysis report

Static analysis result for SHA-256 022fecf51b878b3c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 01:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3ce5855b1b182b530292355c5f038cfc SHA-1: c1d98854d351a68347ca962c9040db822d63c0bd SHA-256: 022fecf51b878b3c3bc4d9a408c68a6725fcd7ba120d7b288ad74326838555f1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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 http://caphegiabao.com/upload/fck/file/nevirodoguxupekobuweki.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d501010ef62---warabudakifaligo.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/67811425391.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b2ee965c---62121727083.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/samijami.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210729_075729.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925717d9af2---93617331497.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/fdd700b11ffd81ce5c294d7bc4cf8291/34205601452.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/wuvopadedizadaviviv.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6515d7eb0---dogifefap.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/nitaleguxesedu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/q423i0er7vlfn5qtma0i3t4mji/rixozalekederugofajupawi.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/16a6157072b9659346c96738a34cd59b/44174376786.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815382b07f---nuvigowubam.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/bad0c50af9803def4962bcb83c3c9b7c/47696910366.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/bijezeme.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076316488603---fewixanul.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/satuvi.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kokinogewoveramat.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b5cad37e924e5457e37304d73ba6fa7c/11029778614.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/gokipoketosomorubuvamijan.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160896d5a105c8---dakujom.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/152159130760a5aad40f855.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb4a94e51---topomajerajomet.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/dasuviwilaxodakof.pdfIn PDF document text
    • http://technocom.pl/editor/file/74766924605.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/33833469073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=echographie+cardiaque+pediatrique+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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 20608 bytes
SHA-256: dbdcfef2bc172dc6ed4570db7d1af6224beddd30f42612fd56720f6557eb3c2a
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 10808 bytes
SHA-256: ad5001891399b8336f403a9c3433ab177aa94254b880e071241f5d08d221e7f5
font_02_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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