Malicious PDF — malware analysis report

Static analysis result for SHA-256 3442b4eff6fb9ead…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 21:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3143c16f52f7aec03f4615006033ba0 SHA-1: 2db4d12ce69b3cff83c16fab6a29767a663e9cdb SHA-256: 3442b4eff6fb9ead8dc162df4955cc4b60a48b35a4c819605f26bfc17bf43668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious sites or phishing pages, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac6f2011c---48596108029.pdf In PDF document text
    • http://sireny.net/share/files/38394207640.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4edc386f---naxapobozib.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/gitarobeviwadinipinowomi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60450252598.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/79418d4d1cb3b676c87190ed45661927/soxowunabowunige.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gegidikejijenibiku.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/zesenodarepegenu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e2e3633e---zonulamewidutokulirogi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/3c2b626d739ddda6e0a7a5536068580a/pulokupi.pdfIn PDF document text
    • http://sin-hua.org/userfiles/nozuwefajekisesex.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/pativ.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/93641995387.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/34497166408.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/wodovupazijodesuzojijaxow.pdfIn PDF document text
    • http://m2m2design.com/userfiles/31476830781.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/gapoxeguzipefefazejopegos.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/60853719346.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/furovepisuvarag.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210915234540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+shark+card+codePDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/81943909862.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_off0000aeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB4 18216 bytes
SHA-256: f29e0e675203edce36ebcdb421bddd5da9384e62f7e18ca7d6c0bf984b89e346
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10196 bytes
SHA-256: 1b0f42c927e5f403b0560b8d14bdf3aa4b705fcaf820e640b8bc1728ee6d0491