Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daa1c5cead55b55…

MALICIOUS

PDF

61.2 KB Created: 2021-06-08 19:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ee8fe9eacb2ecc15713b74a725524d4 SHA-1: 46281ee6c120c5179252253196ef8259952a7188 SHA-256: 9daa1c5cead55b5514bf7ddd588855f7d7f997cbe0c9e48a4291175c7d5275d5
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 or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8016

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 1

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

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