Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f162ef86e3ff8f4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 04:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d4e87958ff55b8d2059a5df1ab5e651 SHA-1: 623fd58a74d4375f42b5279edd66f53798bc72e3 SHA-256: 5f162ef86e3ff8f48dfa6341c2bf50c7eed4b407708d69d3194abd6da9d13cb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://calson.garment-pro.com/ckfinder/userfiles/files/juwigonume.pdf In PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/kotunegusimi.pdfIn PDF document text
    • http://njxinbell.com/upload/files/27608698667.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614932235ae2b---kekakazelelabawanuzavevet.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/nibijudugebasuvisis.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/gukuxovujivus.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/64076152059.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nikivunugumari.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xiripejupasekafebowevikap.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/tuvigaduzodupulumexamegu.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/vikidogovu.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xosawe.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/46210260426.pdfIn PDF document text
    • https://scalping.ir/data/files/file/54690691049.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lfmbd4hdt2o45ld9qge1a2s737/lewesoxe.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/86630854490.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kokopalixikabef.pdfIn PDF document text
    • http://afslab.asia/upload/files/dunexokuzebikuru.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161378549af85c---loduz.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jarudigurekuj.pdfIn PDF document text
    • https://hssanesteban.cl/files/73052168211.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/78944410339.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/pabiniruzazetimok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+fire+codigos+apkPDF 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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16692 bytes
SHA-256: 4fd5f0ec812e12fcdad3d05c9918b56501c11665ae9a682c91b40272df909663
font_01_sfnt_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 10616 bytes
SHA-256: 92e4747098ff67de96af08893e525ecf0e387ecd968d7a89ceb97481a535dd64
font_02_sfnt_off0000f63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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