Malicious PDF — malware analysis report

Static analysis result for SHA-256 165ed32aa2cc03c5…

MALICIOUS

PDF

90.7 KB Created: 2021-09-15 03:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f22ff886057cdfc694a5c182e9c3cdd2 SHA-1: b5d99bd466a0ab7464b9d7e620d8676d7c78dbe5 SHA-256: 165ed32aa2cc03c5d610a797ccd7331a6cf54c20ca420b1c9519708dd9cd6fe3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=p%C5%99ehr%C3%A1va%C4%8D+hudby+pro+android PDF link annotation
    • http://moskvaznaet.ru/upload/files/xixerobowe.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/nudarexepogitu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8e89b18ec3f6edcb9a5b00ac2e38403/46293618358.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/filolidovipesunipo.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/mumofe.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/74060231148.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/kulopaxedelejolafavaro.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210905182223.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/tifuxofuvosur.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/27955122881.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/vevup.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/mavozisaza.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7655692a---noxuraliditomumaluganipi.pdfIn PDF document text
    • http://szhlfz.net/upload/79844727908.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412c4f7c7e2---nopopati.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/29932232439.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614114f3b4b46---71872424612.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/bagolazise.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/91728378209.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/edab4b731108c69d14fcf5e562a4cb20/6397175497.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wijizerib.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/datonet.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/59427010307.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/pipedubajawuzodizuminuges.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/dc56ce6d00d31c202c5aa8f9c375a947/fixeratixuxonozoke.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/52534569972.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/wutunufopa.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_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 11052 bytes
SHA-256: 610e00324f43ecc1fcfcb455fb32275c542ccdfe6b77868201d77097c213035a
font_01_sfnt_off000111fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FC 19980 bytes
SHA-256: 86eb61104b5ca20d4172c5c6c7b93d8d5dab8cc062723fc6fd5daad2f2013f99
font_02_sfnt_off000142fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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