Malicious PDF — malware analysis report

Static analysis result for SHA-256 58843a9e044e0b71…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 10:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d05051aeb8381283175ca9c5c54245c SHA-1: d8363d9a5eddee1fb3e522c34601ad824109d6e5 SHA-256: 58843a9e044e0b71f8cc04426f3809be361b7e145aa1a79b116b7530fe2cf234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://tiendanatacion.com/noticias/files/28278389830.pdf In PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/90066781693.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd79f2aeece---13922581509.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a5bdafe13622defadeeabd54a62f1e85/jupufajogebizopar.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads//files/202108071550273735.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f72e6611---rabomeke.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/wizevesaroka.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/rariperi.pdfIn PDF document text
    • https://medtek.vn/storage/file/vuxebotub.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dbh0n0gud6fua19lv3s7e3u8a2/daxasipapun.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609249ffc0ed7---vetewanulogalatodifu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ad2f4dddb6c75a28606033f48cfa7c58/balififimije.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/kuzepobopodonimiramak.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b570920d31---44453998073.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xogojadota.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/tijukake.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/juzuxamexitu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160775186e2ea6---zitawamuwerejamunolita.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/30279607891.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/61208920743.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7d0ceb60---18481159181.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/79673669825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mail+merge+pdf+attachment+word+2016PDF link annotation
    • 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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 18244 bytes
SHA-256: f5aa13d80c7f23df4408a7881b9c423460eb32d0e7bd4a43b0e7a5f36bab0665
font_01_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 11440 bytes
SHA-256: 11a6583fd6e4fa2b0ed6bf1bffb54e6632099326521d2d6061d3539d8ef00158
font_02_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1