Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9adf499cf59b5e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 23:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27c303a87122e572504ab100360b7c6f SHA-1: 250672ea7cf2a9a02771fd391ee61a5cf879df5b SHA-256: ee9adf499cf59b5e42ff5c269db2fbc2eb0f8701e94041b56b6c3f132b41875a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or potentially compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or exploitation, while the link farm aims to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://chugguwang.com/files/fckeditor/file/63472380029.pdf In PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/20134757454.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/79360745807.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/ponojorakeb.pdfIn PDF document text
    • https://sealskinz.ru/files/file/jufolomej.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/27243854870.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/32123816385.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb615e332---genuz.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/zexoxemadasawuwejomabu.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/nosedufodipuzikajo.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jejudetibafot.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5f2ceb26---luzaj.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/gewesutikazuladodeb.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/12668562336.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/mazipoparan.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/30498026450.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/kiguxubifebesuzorenewivop.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ddf5efc610a27bfeadce84a75adb2aac/bakajipetufeso.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/ruvewowep.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/sikasokerolajuzu.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/bedemuzuboxaxixozotokemez.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443de1c1a5c---tinalunekazedalogififeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pc+suite+samsung+galaxy+j5PDF 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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 17696 bytes
SHA-256: 7550c1632dc1253ef4f1924ac08d4c36b3ebfb3a1e53067a7f94a4663a315bce
font_02_sfnt_off00012785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12785 10936 bytes
SHA-256: 411afd25c9255daeaec351a787c38a891aa25ba14e07bf699b6226d7395e4154

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