Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d07a603939b9ac…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 08:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7792698e30d4f925402c40fd1d06ff76 SHA-1: 8ef056a46de0bbbd75b79abad4d4763a0a088135 SHA-256: e9d07a603939b9acdcbb6ef8ec68fff6f2cc2099b2fa194d7fbc0ba2d1521709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with 31 URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's purpose is to lure users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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://www.nvsrolko.org/ckfinder/userfiles/files/nedomewirenepiwefipupe.pdf
    • https://michelbarbot.com/upload/files/53660559441.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/295ba7309404d3ad69f61370f460a952/5413591401.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b241a4466---96206225781.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/6699953613.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/xixefukovibugixenixavitid.pdf
    • https://bulendengin.com/upload/ckfinder/files/32292748571.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd501d1cc93---56552050391.pdf
    • http://debden.org/userfiles/file/difukodunawivanesokufogod.pdf
    • https://publicbridge.pl/userfiles/file/75226969646.pdf
    • http://cuacuonbinhduong.com/upload/files/87147281780.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/258139410d79c011ebefc489f2fc0814/jufutarumozojosuketati.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b87032c82c9155a249e8f42b2a5b832/40940591622.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aac426c41---tunikigobenel.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/s2g2u5qbo58d4i44om1ikttc0g/10150631007.pdf
    • https://cecprint.com/images/file/kasamajusaz.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b2d67226043e7b423ba5b37a64acf79e/konujevodufugoxanalumujew.pdf
    • https://cytairtool.com/test/userfiles/file/20210628_06b9c.pdf
    • https://sasalidayanisma.org/uploads/file/74335595714.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353bf6094e---69720375359.pdf
    • https://nbretail.com.vn/ckfinder/userfiles/files/94435089609.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/80a905469a184880fb490b7d84a2a2f6/47239449720.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=computer+organisation+and+architecture+book+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c81a.bin
4e4722df22d9063e43bd179ceb87d21e4f9d37b80d09d4ba26104030a8249027
pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 18088 bytes
font_01_sfnt_off0000f6a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 16792 bytes
font_02_sfnt_off00010ebc.bin
2473bcfaff577d3bc652a8a9728581761e000dc480a8e9b5652d7a0a5571fb07
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 11384 bytes