Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa7c2f1a6c40084…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 12:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 286084f6de242ee3650ff1c1e5b00b82 SHA-1: 4678954d5cfbbe420f7c8a12efe753fc468d0b41 SHA-256: cfa7c2f1a6c40084ea2a351fb56dbb02a5b7bd7984fbe16f664b76b7dd8ee984
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also includes numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=hello+neighbour+2+alpha+1+apk PDF link annotation
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c99d681ddee746351bfee67f28fd7cef/raratumeb.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161315611ca42f---4770532345.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/34655007833.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/71405632366.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/subonutenijaf.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/rekopozetoriwexizodewipeb.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/pakupofagalobitikejofusak.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0c4931ac9---vipof.pdfIn PDF document text
    • http://zae.me/datafiles/file/betobudogulazirudema.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/neluju.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/kojaxilememureva.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/6854831302.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1b2250613141599375cff5907a333b0b/wekona.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/nupepomod.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae90763d6---91215181419.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dt663v7p9pbqbf4acadt9tfkvr/tagonujofa.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa08634a2---84942778275.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/36247853522.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/96917135190.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/gunefil.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135aa7579aca---taputemubovokogami.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_off0000c53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 10760 bytes
SHA-256: fd582115c29dd269308a6d9bb89d9c3b294ffe4668d8f626cee97cac31ed9c72
font_01_sfnt_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 16792 bytes
SHA-256: ca0bf1348eaad81cb655990eea1ea3bb98aefa61e74c2b530579d18e0f9457e9
font_02_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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