Malicious PDF — malware analysis report

Static analysis result for SHA-256 957d4dd03993b94b…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 17:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f453b8e18589ad6bc58e19636eb483b SHA-1: a9b7db09665e2a9da579c54eca65e5324821d48e SHA-256: 957d4dd03993b94bb95ad6350ca61cd177066f7faa5af4da982d67fdcbbc8d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the link farm suggests it is intended to deliver a secondary payload or lead to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://cortabellanews.com/userimages/xaratavatonupawijag.pdf In PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/vagutewowepezuvofaj.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/62007e2a1ee8903e35153abb4b2d10aa/86717763370.pdfIn PDF document text
    • https://birudongker.com/contents//files/sipijiwakonux.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/5o7g9n6v85rr89rnu5maimsk92/kakogufakidafozew.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/36532694954.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7a099e6a1---nuviroromugupokupo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/9326068435.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/zelumirerifejuzesolike.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f450f48e55---zilanujafezibajumise.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/fijazibozoruzoko.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/69ikic4l41rj8gt498trun1q5v/1336363228.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/wuxipiso.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/88516117992.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/72f982387dc0d4be27cbbf988cb339da/1243451033.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/takijajo.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/sopibovuvorosogeju.pdfIn PDF document text
    • https://ckmandarin.com/uploads/pijevojizokogo.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/56083946338.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/lilomuvemukenavemapak.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fbe808918---60101320618.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/43204273151.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c318bc6a987---42754714552.pdfIn PDF document text
    • http://sieuthibds.net/images/files/suritipomedow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=conversion+de+decimal+a+fraccion+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_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E0 10780 bytes
SHA-256: 04422fbea8ca23ed7b93b84639596bdc2bba12094d55efb7bbbd4b4ec0435e6e
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 18892 bytes
SHA-256: 0f950cda8a71bf039ef7e8299cc26469be6d06cd6a7864ce3e3868a42390222f

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