Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8adf66abcde4e73…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 14:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a047332e877736f140b410bcd23a344 SHA-1: cb0197424895d5a1610b2eac439f29829c6ecf11 SHA-256: e8adf66abcde4e739f7e9c4412a5d2a2254372b81b5b1f5493695e20a2e85690
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=radius+diameter+area+and+circumference+of+a+circle+worksheets PDF link annotation
    • http://minniemleefamilyreunion.com/clients/4/46/4626b253669c69ed517e077132fb6553/File/28208515897.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4226940da253fef9f500d0766bad3567/bazulalebegedalinuj.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210802184542.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8cf5a9f4---warulopepej.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d9c9f14a8---27977425271.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/75828096668.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf43ed73d---90496104173.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/20e3e135815ca4598e5337418923589f/welisamojemofulibabunexat.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14d2bed2b---99219270106.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612686dd3f233---84682867521.pdfIn PDF document text
    • http://4bx.pl/public/file/wipasuvagivegonojenosov.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb41abb535f---zomotuwirikegexuji.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gojozexisixefuwuzetegudij.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/591ecebb90a684954750200d752ed0d9/kijelilolez.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/58389496690.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/67374481728.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/79676566160.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1babe5abf4260e6adb9dd4cd3eed9d26/nipopi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5bd92eb3e---ronikemiwev.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/be8d689cd2120ceb59be4a81af61d3e0/winigekored.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/51745744450.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/kevavinefo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160883a67e23e6---84873678063.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/66182787182.pdfIn PDF document text
    • 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_off0000e5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 19020 bytes
SHA-256: 5db535b76484f1211982cf7ed915e1a0d786356ade3e7ee81ef9d2a5e5940eda
font_01_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 11064 bytes
SHA-256: f9f0472f6602a43e2e565d06cf5fc760c3ab3ce196f76bc159f298986c7b7e35

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