Malicious PDF — malware analysis report

Static analysis result for SHA-256 521c482fdd58e244…

MALICIOUS

PDF

69.1 KB Created: 2021-09-03 13:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46cd6281041271146e65da2384d0c5b5 SHA-1: d717533acc98dbf502d2a9d1dce8b18072f073fb SHA-256: 521c482fdd58e244fcd67a762ce7a47dd16471639ffb6692445d791bb944fd60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wish-pharma.com/upload/files/tonuzewemedulojewaw.pdf In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jd75k99qadac8a4rvjhokuv6ut/9686108230.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/6ecd01720973a2e2d45c5ffe2e121e39/54397925847.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083a2938d8a0---65756950885.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/xakixe.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c877bc2db14---tabakuredekudagibaxiw.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/rifagupoko.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d8a814c4---farufasuwo.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/mabagivovito.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/t2eetbo3l997e0353s94rfgsdm/xediwakigabovepeworu.pdfIn PDF document text
    • http://imi.vc/upload/files/nenapixutokumedelagefawev.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/dasilaguwoxenu.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bffbd341---berel.pdfIn PDF document text
    • http://masonhn.com/d/files/gupemexux.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/0virani7qmmm4tdsqffq0pvjsi/87281688763.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/5144196132.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/wazegakokaligubidaj.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/95362790731.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/tipozebinesikewujoseku.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q2rceohfl96ro0vac9vj2un6ek/xakonaxenafelenamuvidun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adding+and+subtracting+negative+and+positive+numbers+worksheet+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_off0000b06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06D 11484 bytes
SHA-256: b2376cd0eeb5164dedf32ec4b3633c47c79f574331bf720b18de8e604e12cf6c
font_01_sfnt_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 14360 bytes
SHA-256: e9dbf793b39804ba6507d06b6f4d83f37ce28148c91fe7beee56ff048d83393f
font_02_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.