Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e251f3a75d9fe…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 10:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3fa7c6d9f9cf046048b7d8675f049db0 SHA-1: c22ec02ac29cdb94be89019724d38822173c8048 SHA-256: 923e251f3a75d9fec464df837785bd0975c638ce3c4d9bb1ef225a27b913bc94
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://adacu.org/userfiles/file/20210905090633.pdf In PDF document text
    • http://kameleonhastanc.hu/files/file/47391891807.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/25469758532.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/46043971511.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/38767902264.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/26546517074.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/30127529171.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/23671553502.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16137fee5a7ab2---40586683759.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/77614785289.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/12271175767.pdfIn PDF document text
    • http://adveotec.com/img/file/gasaferetaxunora.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/62675298106.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/tepabinizo.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/nuwiruga.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/zizatadobegafewop.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/mofinivakaguzosono.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613028813e48a---40365544432.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/80960717257.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109050535546440.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/83945019917.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/15768017725.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b707be4291---jisopimipunitisogaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+1+true+skatePDF 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_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 10420 bytes
SHA-256: 5b2564597d08339624ec77cb2b43dc20d251a6b1307c1e1a77bf91a4df08688a
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 17312 bytes
SHA-256: 8d41f6d507479d547c6d9a36600b13ac549fa4b73dc27b27d97ce223b4f8889b
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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