Malicious PDF — malware analysis report

Static analysis result for SHA-256 b458f43cceeb4b7b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-23 16:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2880f8078ff5ddfe75bec8b1f116cf2 SHA-1: 7b708ee8b4a02ebf8b99acf6b772d93ad4dc8914 SHA-256: b458f43cceeb4b7b45f6bfc057db02baf8c9926796862ffa79aa30a71e62af33
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gmnavarra.es/ckeditor/files/31821638962.pdf In PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gagozinolokanolatomume.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109052108546516.pdfIn PDF document text
    • http://teakdeck.pl/files/file/nukinus.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/gubivu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/703pvo4v0k9retre2nllj3uhe7/19934232961.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/61914874436.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/sojepi.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/f211b7e80df0e39ad1863fb93ae1c16b/96502700247.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/rawakomiwa.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/woxixubenaniwatiteliku.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/15787289188.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/pudidomegudali.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210905_46F6B89F42B8CE60.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/dereve.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148ec4ce3d8f---jiduwix.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/lejiguluvukozumebiluzulid.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/93809236377.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/vuxixivegale.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/18105890705.pdfIn PDF document text
    • http://artio.pl/files/files/72386900282.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/51115169218.pdfIn PDF document text
    • https://hssanesteban.cl/files/xukejowupof.pdfIn PDF document text
    • https://quizai.com/uploads/files/61256992476.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/43862164117.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/didutoloserogekewomodaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sign+a+pdf+ubuntuPDF 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_off0000b0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FC 14556 bytes
SHA-256: 25f3a4ef589c44939c19b54003362803019f8a99546a0136b41f1cab6496386d
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 10420 bytes
SHA-256: 986552620c0739906dacbd14f8538a5db872e1930b73bb3132b1b97fa20cf278
font_02_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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