Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a07fc13cf406b81…

MALICIOUS

PDF

137.3 KB Created: 2021-09-01 17:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4abc09e1a84c26a156d8db2f85983bf9 SHA-1: ac1b91b91e170e794068400d5e597bdcc742175a SHA-256: 7a07fc13cf406b810159bb7388ddeda1db5bc25f1f7e24bbf44d3fd9748c0207
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af860c559e7---31536761049.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93df50dd2---wararetiniwiroropotusu.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/41527676451.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/temopufejapezepidaf.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd3506aca---bulodupakubutim.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/gelilomusuvutudade.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/54860662655.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7ad4bc001---kofor.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0309520ae---19834755639.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070482a65921---68101012773.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vuwusafos.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2747dadc68d2f735a7c0b47d46370cda/fosuwijemeso.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/ketutejutugole.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107221305241240.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ejcgm86eni36l720tubavg3bq/97605127254.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/dabusabamubakomuxadilegan.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/fukezujenejapan.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad8e491c1---61269334477.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6eed936cf---xilugajiji.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/5051475765.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100485b4c94d---sonaxizodebenifelexe.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/63470092058.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/40133237528.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/wafokiwaradawe.pdfIn PDF document text
    • http://princeverma.in/uploads/files/tokeginapigiwaxugojasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nordyne+furnace+troubleshooting+codesPDF 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_off0001b2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2F0 18952 bytes
SHA-256: 1a9a3e20d060afb9cbf9a4d14d807b1d87e8af930854b07c1f95decf56039db4
font_01_sfnt_off0001e40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E40E 11088 bytes
SHA-256: 24e6366f963552a98ab6c1f51e342e710da5f9dc6d94a05fc81fef8ffc93c2b6
font_02_sfnt_off0001fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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