Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dd3bf805ab38b4…

MALICIOUS

PDF

94.4 KB Created: 2021-08-09 11:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c9d745b9781d18c489738eab26a9594 SHA-1: 5f86631c434606e92267ee506606fd255274f0f3 SHA-256: e0dd3bf805ab38b42501a5401393ea22d4784f7e1a4ba2baace246f424f57f19
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, some of which are compromised CMS uploads and others on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://wegofa.com/userfiles/file/23431474342.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f82725518---vugegi.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a4011e7d5e527574ebe3d2b918972e58/99127102842.pdf
    • https://unibel.pl/pliki/upload/file/70817286924.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ec32f5ce359d5c5a2ae5ce4edd7e89f7/16629739568.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ccuiiqb5n6dqi8sm8qu9ev38k0/59570911586.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/16083032013.pdf
    • http://hoskinspugs.net/clients/40498/File/wixefanekenanudobin.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8cb44cba57f4306b4312f748a538f494/20144622402.pdf
    • https://4cmedica.com/ficheiros_upload/file/9578237766.pdf
    • http://agt.es/files/galeria2/files/11386466457.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6n1g5bms1aljfsbug204fg9cat/xuzovematedusavores.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15bc9f421---fipuno.pdf
    • http://amoy-art.com/Upload/file/kixilisaxawefafelix.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/25416375d8a0f0c88c877efb412867d3/jakofefepitiparijivofox.pdf
    • http://firewheels.pe/userfiles/file/gakosepevesel.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/70994525125.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/372f5361a50b52e25823a1f6962c3931/dorabavemenupe.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fifebanaguwalo.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/fbake36sefpa9vn6qi37v0h4nk/gigiwajabedaso.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/a0rs9pr70bgosngksrr78hcjoi/89565989493.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cctrgbdotblrv61bg44qivnh00/33568444003.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f3ea33d99---biladudilunur.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b40e2ccad---60839823022.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ejemplos+de+pares+ordenados+para+ni%C3%B1os+de+tercer+grado
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee43.bin
471f4ba351ee2a0bdec3e6456d9ab989e9182e6a968e5095141dae1fdf3fd450
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 11176 bytes
font_01_sfnt_off000107de.bin
b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647
pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16244 bytes
font_02_sfnt_off00011dca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 16792 bytes
font_03_sfnt_off000135dc.bin
5dc7a29fd35072c2602ff810c2cf92a7532ab60cce473828f3e621b6ff725da8
pdf-font-stream PDF embedded font (sfnt) at offset 0x135DC 19620 bytes