Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e396abbf7ada49…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 09:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0865e69706eb2a2567682bbdd7dc1035 SHA-1: 2fc35d48ec5cdeaffb66e090b6ffc9fbd952dce4 SHA-256: a9e396abbf7ada4920334796d1213d7d3f9f3a4b5f058fe3bb2fa2becef81ea9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's designed to redirect users to potentially harmful content. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a2f84dec6---20445763721.pdf In PDF document text
    • http://sowa-architekci.pl/userfiles/files/63620810805.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/tarunoxovokuwutevolugeg.pdfIn PDF document text
    • http://skomi.ru/img/files/file/61011322647.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/24729269279.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b660b0c9de0---56753252433.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/cfea15d6eea15c9f530249d740f25f1a/kexexejegepasowe.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e6a956f71---49050545295.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/71716480437.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611193a622e5c---85990545100.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/30567461695.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110568029432---susinetal.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/jujukowevuzufowu.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/99899633149.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4edb7ae904---77046707270.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/636e34c905f0aa181d2f0c27177cf62a/dezogepowegejuwexafamow.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/vuwigigadaluk.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/mototadetupuvodusi.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/xidasowenesek.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f09af279f2e---jexujiwepisajirakuvu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5d541d80e0ff670b6f52f03d5d5a4b0a/59269547290.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/69126212257.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/4052712555.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/95720313920.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609229ee97474---riwonosizubirotiv.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210826_7393AF0547248B71.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/042025be6aa1dfe3be6ab79ff75358d2/xefodejewivefozidafopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+sociological+imagination+free+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_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 11028 bytes
SHA-256: daee57d4a2436c971d5e719e1308a623830d8b87f7789adaeb6747350c5461f0
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 18048 bytes
SHA-256: 06df3d11e3ed478e6cae00e24b02763301b00a243f5c165b983a94c0a0b8093c

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