Malicious PDF — malware analysis report

Static analysis result for SHA-256 538db47d1d16703e…

MALICIOUS

PDF

83.4 KB Created: 2021-10-05 23:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9170c492b6fd035f647ee54ea077ae05 SHA-1: 90f425467e632c8327ae9e82d6db1dc9293d711a SHA-256: 538db47d1d16703e73ac3c11205f1eecba33d80407a5161e4e8a9c6ca2eaabf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=streptococcal+infection+symptoms PDF link annotation
    • http://malir-naterac.info/UserFiles/File/vevufofusamepazaburo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/vuwomuwu.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/45198772375.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/podovasarikeru.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/27638319557.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/gatamajapitelezivaga.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///dixagiforoxuk.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/73873092762.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/xasor.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/29635427491.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/78529273643.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152854a04d00---20072462019.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/gekibut.pdfIn PDF document text
    • http://mayjack.com/upload/files/velosokewegukorevakajena.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/72643529401.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_54202A8A568B2AD5.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615832c330c6f---27874348810.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/69154302006.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/migome.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/fsh1rtceubtm340448u6pq7t87/samubugesutoboduzisal.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/5555534911.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367764c6b02---niworumoburuvinataxob.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/83137201586.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/35208178306.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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 10828 bytes
SHA-256: 7e2c7fffc203d0633403961deb48c4add7b7f2ee8fbad75ba94d07f11dc56c9e
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 19380 bytes
SHA-256: c4937c24a73ea0b9ba7ccdda7713fa345e37c9307d469962bf0bbf425db75872
font_02_sfnt_off000127a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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