Malicious PDF — malware analysis report

Static analysis result for SHA-256 593b9d8e176c7cc9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 06:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfe023df5522ae8e01a7cca4913f4a13 SHA-1: 43f74e6162b58f92caa21a8d16b9320e9e2ecebe SHA-256: 593b9d8e176c7cc94980c130aff426b682c3472bc5b13de42b34ba3a3515230b
104 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple compromised websites, suggesting an attempt to trick users into downloading a malicious file. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a malicious workflow focused on directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 https://sanruouvang.net/images/uploaded/file/97449772178.pdf In PDF document text
    • http://vucert.vn/uploads/files/20734716740.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/kowofixixu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d046d925b4a7a985586fefcde2671e41/xobekodumivumukijapu.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/pokif.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/49225892194.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6bc9e529---verijafunitef.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/45222038343.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6ffa0d95---25749187915.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d21ed7d97d---rewuv.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/75164c701d41ccc20487c555531cb4f5/37160866289.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/27904093738.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613905767379f---sosemibosu.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/70306754631.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/satum.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210908142402.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/41082500861.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/0991661ad97d6aebd41b33dc1a0b2da2/64756283903.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xumoxedoxavuxize.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/vewuvubodizidawowexaxep.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/vimevapegakib.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a62cb1fac---57932121792.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/fadesarokofopiredarosowu.pdfIn PDF document text
    • https://ismart99.net/upload/files/20389051854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mod+apk+of+ufo+vpnPDF 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_off0000b959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 16364 bytes
SHA-256: e599a4e38847c6eee6fd1946bd8a2a866577156a5b50690f379393103bd970f4
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 10108 bytes
SHA-256: fbdc6b3d86225c09b6a91d9d816a5e2c69078d6d88e57ddde8a179dd755f0405

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