Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cca3f97f1e4050…

MALICIOUS

PDF

70.8 KB Created: 2021-06-08 19:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7244688e2a2fa0b1b510b848d2d786 SHA-1: 7904a99462adacd343e7165610225a414004535a SHA-256: 55cca3f97f1e405097cf338984d1b7d02634d9cd87503ee3e01e3328d42b21e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7642

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://smidgel.ru/uplcv?utm_term=ready+reckoner+std+12+pdf
    • http://mdc.ir/ckfinder/userfiles/files/zazeli.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a79a7843c---madabewunudatobowigunewo.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcacaafc2---vuwekosijawi.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d0c07ca9869fbf593c252b8313b9467f/40258805121.pdf
    • https://arvikabc.com/images/uploadedimages/file/xowiwukupibeke.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5c74b8058025eaa586b0cf3c604d3c2d/wawuxeke.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cefc3ab50777549010e5fcd3ae6e62cc/4649127952.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/38c85869ffdc1708b0cdec57adaed8bb/89837336207.pdf
    • http://asckhn.com/acskhn/userfiles/file/mazir.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fc0765ba950b31866a587a9baba8dd9a/nomevamogaxotuvezopimeg.pdf
    • http://jshtextile.com/UserFiles/file/%5C/kisoveganemefotigajaroxe.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac5d8181ef---91456778888.pdf
    • http://metapolar.hu/tmp/xutesagoro.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608faf88b478b---86468668281.pdf
    • https://antae.be/app/webroot/uploads/file/rorirunodejun.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079403ac963a---rufubagurulukukasefufipo.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5s1jspiq6a66ru5eod9m9nfjr4/78186580009.pdf
    • https://iamtimeshare.com/userfiles/file/62504216199.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd04.bin
95c55ab59016c40154e61e489db08a9fa082b91cf6dd1583d9f42a51e1e186ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 5472 bytes
font_01_sfnt_off0000efcc.bin
2b1b29723f899bf8010a7922a2354bbee8522f39be12c6b65d3d30aee07318f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 11136 bytes

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