Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2c52c563e307d8…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 18:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5203585c5f4fa29e2df868132a667ce0 SHA-1: 1cd98e1feb09598b582cfb08ea6eb4631c6990f4 SHA-256: bc2c52c563e307d841281865e4c76eefdd51b2297b3c0d238f1bf58d4aac8a53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=sound+meter+pro+apk PDF link annotation
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/64ce64062262e7b435fce30449609c77/91821989516.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39109215667.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/82892788624.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/72727627420.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/pukore.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/zesexefemesuparegilem.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/rurumanoxivonekumoduso.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/49431615827.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/62cc969ae3f23edef3926e4e6e341d81/mavoferebidodesurow.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/zotitunazemolefavumobe.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/wonilirofukujula.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a54a7fc5---wikirujepixobixadoxone.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/36087123234.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/83131266228.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/sasagujekano.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/toder.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613254D37D250.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/kewivirinewatozabanofatex.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/26598656521.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bbf36a47---xerupifogukuzikalit.pdfIn PDF document text
    • http://vaynhe.com/upload/files/54103009442.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/mufevuriwira.pdfIn PDF document text
    • https://lapdonline.org/file/16280218533.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_off0000bbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 18896 bytes
SHA-256: 18dd260c5ab08abf976fc0c8e314f2323b7453bd055a63678cdc58b322b5cac8
font_01_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 10516 bytes
SHA-256: 8aa71cc545749916f689df4ecc2f2ed2f8649b24f853e945e3ebe65e2443162d
font_02_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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