Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52449abe4cc7e88…

MALICIOUS

PDF

96.9 KB Created: 2021-09-14 06:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c06380d096a36b4d50559d61ada960e9 SHA-1: aa0485f4e05a9bbd31b17f2ab61a127f5393fd57 SHA-256: a52449abe4cc7e882f16ace57c43c1560ba2585d2259b801c4b247acc6e34552
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and presents a fake CAPTCHA to deceive users into clicking malicious links. The document leverages a link farm hosted on compromised WordPress sites and disposable domains, aiming to redirect users to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://thepokeluau.com/uploads/files/fusigefafovawexim.pdf In PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/8111625539.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/dijokurisubedosip.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/sejudowajemekoxujabi.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/59350635101.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/zerogejil.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/vaxewe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d89fcc2b4---mipavigo.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/75595023504.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/67156006459.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/dosinuwipuxerefixuf.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0013c4ff2---62750048955.pdfIn PDF document text
    • http://kleiberit.ru/files/file/30120074580.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/92184216433.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4adc576e---87360086918.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcc670069a---sididu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/83803871258.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/35448475427.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7d2897a7d6e1a2d9d9d83dbd8b833f61/45624019500.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/12/70151064352.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/82558c5487ff9a0065c1b75dc6649044/devenudotezatobomet.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53655c7d9---xopekifotegavonur.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613836992ff4b---9340766420.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/32753599631.pdfIn PDF document text
    • https://zagi.hr/files/kibedejipokuguzufuravovol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=methylated+spirits+chemical+formulaPDF 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_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 19040 bytes
SHA-256: 6de9de9aa3fb24cecc2deacd89d7c05730da5b3fe05e42da7178a3052e1cc2b1
font_01_sfnt_off000143e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E6 10988 bytes
SHA-256: a97f8e27ce35ee9a40fb113ac334ec4d1461444f9e16ed4038c666d77cf8ce1f
font_02_sfnt_off00015d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1