Malicious PDF — malware analysis report

Static analysis result for SHA-256 0688b0ed91948700…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 20:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21d5ccdafab58e5b4c2adbd947ea3126 SHA-1: f211cc0f2b21bd1d4c2d73bc8087174b88bcde99 SHA-256: 0688b0ed9194870079cbae0df0dbb654066d1d104a0892780761e1a7a23832d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/142bef068490ea2449d4fd6e014c690c/wimalujotupizazu.pdf In PDF document text
    • http://jinanxintiandi.com/userfiles/files/27087902424.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/98611529895.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/sovorowigoripo.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/98433058652.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/80158324609.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ddac3f74c---bobizorifosixitofena.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/sajusejolasiteboku.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161179fe699e8f---31382229902.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/sakotawedisepepalikevu.pdfIn PDF document text
    • http://axwelindia.com/uploads/lewixaf.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/30c9ulh4gntl437ra2rqnegoq6/64223099421.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/67834108c62c69559a6acc5cc743f0bf/90230705724.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/37134820215.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/somirozikamuson.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/purivupis.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b016d97ea5---75152533840.pdfIn PDF document text
    • http://yejida.com/userfiles/file/16207124960.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3828068b---72383538854.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/31062730053.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a6265bfa1---94703238366.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/femalebuneroza.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/mogovasufalomaviwolebugiz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f268967711---pejujidonedawugujuselo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=postcholecystectomy+syndrome+treatment+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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10908 bytes
SHA-256: 12766bd5882d70c83b37f5edf71bd7c787ea0ccb520b95b9b6fa7fa3fd1045ae
font_02_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 20124 bytes
SHA-256: 3b56ac349960a942ac252a6356e3ec5978093578c42b6b709b7b9a86c34c0aa8

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