Malicious PDF — malware analysis report

Static analysis result for SHA-256 327e313817ed2345…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 01:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7cfd7ede4d0cc824e7bb0896b8d1c198 SHA-1: afec9dfec52d864081e28044fb66ec1357130081 SHA-256: 327e313817ed23450c06c7ea09651143cc065d98bf7747b7893dc5b7a5502d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to numerous compromised CMS upload directories and disposable hosting sites. The embedded URLs suggest an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ranjitabiswas.com/userfiles/files/50581506269.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/42e0d20fc65a1901964ed4e9652b05f6/lozogovegopupirozegepe.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/nibitekijabadevubix.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac6c45448---12345158304.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96075317767.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080447d7e16c---93594938887.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/sopur.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a98a2f12f---budogigodokoxopaz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f1ab1afdf---18993716743.pdfIn PDF document text
    • http://greenbrier101.com/userimages/xafoval.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/kekidutove.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd44be7ae4---xuwalezikidorimabuporot.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/13003224882.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e053aaa47d42f107811c139ada8a60be/98285628305.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16081c448dd599---pozezalo.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/nedomisikotaxotuwu.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf56b148e---28088757704.pdfIn PDF document text
    • https://bamor.org/userfiles/file/28488055091.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/avd2qo9dap7lg4efk6hiuc0hu0/revitif.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/21746323009.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/31024597601.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbdbed691---62744407824.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/buvofira.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/56741277404.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/95473565313.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae62a4709---ralizexisafivapikiputefog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=making+the+rounds+gestaltPDF 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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 16536 bytes
SHA-256: 8053f8e426ecd2158e00c8817b190c1d26ba38618a4ff01a413168f35f81f2c9
font_02_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 10712 bytes
SHA-256: d02cea0fc9d16785cfb4701971daa3b62d7dd7d567ca21df8db3b364c44d4445