Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e24688f64114a2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 08:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2e519872eaf71d935a0d09cab943e98 SHA-1: 2fa4af5c54f960adc2aa99b14c9534972b7306b8 SHA-256: 18e24688f64114a27331ade46f95ce6c8c13fbf50a1c180c76d1fbbcc799e4f1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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 https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/413e3c61eabe40d17454ff363bce0306/ganabugigefibetodarexo.pdf In PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/v5010nm5rbvm0hiadi3r4u5kk2/sobuzatu.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/damosowowup.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0cd9166c7d0f490d61e8f89c79497c39/40588080264.pdfIn PDF document text
    • http://www.toptehnik.si/images/74673656041.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/lojituzununaxe.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20218302152547100.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7co3dlue2h2s37fjj4b46sunss/80994467558.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210726_08923611D19D0331.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094acfc93450---57524004712.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/17e4f77c199dac181d3138c1ff020523/52106278958.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/movefit.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/gatagifanigariwave.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/janoraxumajibabitumafumo.pdfIn PDF document text
    • https://vientangluc.com/upload/files/zujud.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8bea8c885fd42ad6ce9f5a117a60f384/puvixekubibazugakugolaxet.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/xojerodeno.pdfIn PDF document text
    • http://terminsk.by/pics/files/87105170368.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d5728764913f12d02f17eef062bc209c/3499241099.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4111cb0e2e258e72aa7c20c6d3ce08ed/ritenima.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/36809432364.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/diwuzevulawaxoluput.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6e75fd2b---61471323816.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/46572959616.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hjg5i7eh2qv2snelrqvb57o6v4/dedimimukosexeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=graphing+equations+not+in+slope+intercept+form+worksheetPDF 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_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 11392 bytes
SHA-256: a252279b08da49b26eb2917cf0d90f7aae06b17f893256c6a45c0fef962801db
font_01_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 17248 bytes
SHA-256: b795fef9db35956660c8d7572e4ba2f044c229b6304f0c749f7dcbee1adb0b8a
font_02_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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