Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a35192b99d3226…

MALICIOUS

PDF

85.1 KB Created: 2021-08-19 14:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 146bc15ff4f7a586116ee951f667d1f0 SHA-1: d9f395dcb762c40049555e1c54f03d9f29f23675 SHA-256: e0a35192b99d32261ff068c644a7be2139bb2733d35bedf7109a34bff28748f7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to PDFs hosted on compromised CMS uploads, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a larger campaign to redirect users or host malicious content. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://makiriaszto.hu/ckfinder/userfiles/files/mowobekezeno.pdf In PDF document text
    • https://antae.be/app/webroot/uploads/file/woriwudemekiwulajazagume.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160789f21ef097---pedisusufebuzaluwunadarod.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/fewurimawozezofigeba.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2058c96fb---fevoratomanowikadagalew.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b495f2ec43b---nigogedututoguwejidolo.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gihjvujvj00lt33t58p12rlm13/14570446724.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610762ffec0b5---9996315061.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d0632d9b6f761c950ac193745792f024/temojopoza.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/kuronejofaro.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/13732707657.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/sejasimukufis.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d35d35a7c0f---dumuto.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/gotexeradumagegudip.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb80c5c0---sirejugidal.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c01e1115e---kamabixul.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/8roepc55gscub07a3dra23vp14/fizelegazi.pdfIn PDF document text
    • https://patc.fr/imagesfile/tuzipu.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc4961f4c---41984343783.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d5e9fd3d---27748714117.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/93385903947.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab28b47714a---57942690940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=elementary+linear+algebra+with+applications+9th+edition+bernard+kolman+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_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 11652 bytes
SHA-256: 22ab92c61b61c0c77875d8bd5bb23eb89f0999dfdf9ca212b4f88a75ccb64c2a
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 20268 bytes
SHA-256: 5003a769aedf841fd719b262b40afd580519f920371e8391bd60f37d2aef3280

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