Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed17e6e643148d17…

MALICIOUS

PDF

123.6 KB Created: 2021-07-01 20:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 337798ab29fce96d7fb46f972d424441 SHA-1: 97ac0e468b4e7d65fa6272a57f138e9ed5d3616b SHA-256: ed17e6e643148d172af62e66967915726d7e8fafbae88d01c3889e5b1fc9ea9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further compromise. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe1ec6354---rewejumek.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8d70d173---nilimisojozimi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa0d52548---janadukitotoberinugisa.pdfIn PDF document text
    • http://giga.sk/storage/file/misitipuwubaginubigo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fnjuh5bcpc8jon7spp4k1u1qp5/vavofogogiriwekiroteka.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/820143cc09e96d2cb9d2521c8199e8d9/12383002302.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/84b7a511e7223799950ef28c126ea2df/xivotasazuxoziwa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d1873433---27088509576.pdfIn PDF document text
    • http://mp-journal.com/media/file/fafom.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79680dbf13---56710246305.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/sivirubosokujefub.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ecd9883317c20eb55bb5097d527e02e7/kitipojaxogiw.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d673bd1115---28525737771.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c44ab9a47---59239324452.pdfIn PDF document text
    • http://kotolantopeni.cz/file/69569127251.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/88965019690.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/629569526.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23817d049f---ligolomi.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160daf6e9a3ec0---76720677681.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd596542c9---3086777558.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a90aefd3802---50382319718.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/61421216616.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6tb4opb6bot9bng4g33dag3uoj/58550861185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=names+related+to+aphroditePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000156d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D7 17076 bytes
SHA-256: d84d55815855f7e1e349fff4f2223cf08ee81133607a4a72e116c92876fea721
font_01_sfnt_off00017001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17001 10528 bytes
SHA-256: 5d7bacb58f6f65bfc054c4df36f5a7ffbf7b7d00470c6681d0095cfb96aaf724
font_02_sfnt_off000187f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F2 28632 bytes
SHA-256: adc042da06918418176bb735fb05c5353dfd727bbb1bf498afbb258e58667a7b
font_03_sfnt_off0001c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C83B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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