Malicious PDF — malware analysis report

Static analysis result for SHA-256 7500e871ae8194d3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-15 20:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 49984810628a38bf24d79f1c4465cafa SHA-1: d8be2c283d99cf818cbe8ec84f2df20d8d37cf14 SHA-256: 7500e871ae8194d3def2b4bf40fe79733eeae9465292191be766e51822a118ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains, likely to distribute further malicious content or phish for information. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • 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.
  • 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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8aacd191---37801886788.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/20451002287.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b74a4b8ad---tavix.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/15013661037.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7014131432.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xagivufenaxixikowuwati.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wonujunipebigolun.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/5219308422.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/88655292009.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/tulufakabupikusowo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d0496352---81605350534.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/sopupaxetixedak.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/katunosarubejunepiz.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/wewigunulojilezutavu.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/silorabusodaki.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/20053799506.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/zupalejapexopid.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/lawumipoduvinoxupikiwi.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wuliwuxaselu.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/28338161745.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/39721265548.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/vapopevaromimulinoj.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/75200583818.pdfIn PDF document text
    • http://screen.by/images/file/zuxoxetazajogaf.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/71397566150.pdfIn PDF document text
    • http://air-ned.com/uploads/files/loditonagagik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=strong+words+beginning+with+aPDF 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_off0000bdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB6 16308 bytes
SHA-256: 640a2ea4bc94c910f423160500a9ec09197683d4c94045e1fc49364ff4e72a01
font_01_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 10784 bytes
SHA-256: 45facb4745b18c994b9d7558366caa6ad0f4708aab0d375b0fd901786d7a97ad
font_02_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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