Malicious PDF — malware analysis report

Static analysis result for SHA-256 890948b62190cef0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 14:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1b3ae21dadc054f72df6b1cfa5343dd SHA-1: 96aba51f9f01e36829eec324c4d12bf9f4dce9fa SHA-256: 890948b62190cef08b37bf36b8b7bb1381f2d81f61a4c03af14c39b04171cdf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02100c02b---1554754340.pdf In PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24296695593.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/77890057184.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/4108103844.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/litivisabinirasadizawax.pdfIn PDF document text
    • http://newshop.jp/archive/file/vipiwufobidokoliwawuzoma.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/20660104948.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/vebemaremefodeweri.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/es25kruc4av66g8a63v7h83isg/85009133232.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kukugojaburagugowotepeg.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/145c72afbdb70bb2014819d71c015353/27908227119.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210904070802.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/wogagun.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/wilurugejida.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109091905536821.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zozobijatitubumozebesa.pdfIn PDF document text
    • https://mimpishio.com/contents/files/maruz.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398e5f91fd7---52118979640.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/46131681353.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613630f1642f9---8196302269.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/tozedebo.pdfIn PDF document text
    • https://bnovum.hu/downloads/rewobi.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/kawasenosoxusofalov.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/8760920587.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/86844025632.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f521cc43d---nemogubobulawavugimasubof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+print+from+android+devicePDF 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_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 17620 bytes
SHA-256: 9b29c4b6ce79acdab823ea21f92a6726f7b5ef37972b269703fc14a1c4b2c773
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 10708 bytes
SHA-256: f97bc2cf83f949904ee32687e7e4e7b562b770ab228bece976d0e1d9ca1c491d
font_02_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1