Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce37b6a3acecad4…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 14:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6c6c8c6f1bad8f97a6d9581758a486d SHA-1: 096250be393015060a1b6f6aa91aa5fe8d50f6a4 SHA-256: 8ce37b6a3acecad47236e43b39464b11a518166a83aecac4223431d7ebdc98b4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised WordPress upload locations and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aldwalia.com/userfiles/files/negikupige.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/342459f006a72422218263f843e64476/1062445654.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9df2945bdadee91934e855748ec9b37f/93646543237.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e8c8a0b1---lexulokolilebefak.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f78f5c2ec---22135783523.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/319fd6dff9d32f39d63255e5222c6f9d/29085450361.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/b3857b70e92b18e4917f2abf3ac695c2/47025351795.pdf
    • http://guides2alpes.fr/uploads/file/zidevupufivaratitoj.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/93352764047.pdf
    • http://interel-rus.ru/test/sites/default/files/file/60935185089.pdf
    • http://gdlianyu.com/uploadfiles/file/biwomenoga.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca5b0710b---rilepapagukanabikaguxuj.pdf
    • https://faktxeber.ru/resimler/files/warafipuj.pdf
    • http://www.cafeinca.com/img/public/contenido/file/veweravinusuli.pdf
    • http://ipceurope.eu/assets/file/zisasidalija.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/6eeb8f9fdfb8846f3648b1343f3813b6/76026647255.pdf
    • http://lavalnerina.it/userfiles/file/45051172442.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c223815ba8---85418946113.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c9637209bd43e36af983d6d49e355f15/kenibomoz.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/c65ed4fb53371403e582927c32295718/46295503184.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0ad3292b---62816868323.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcc08c224---91316148641.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/30016494392.pdf
    • http://healthywithhart.com/res/file/nafopabafamejujis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=land+and+water+formations+worksheet
    • 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_off0000e7c9.bin
efdcff8aa8e0bda22a27413159a9f0a9b72955c4a7d9a31de8f7dd1d2677f8cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 17620 bytes
font_01_sfnt_off000115a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 16792 bytes
font_02_sfnt_off00012dbb.bin
308383fa6fb1801d86f0eb441aa89e834af173f0c87205b1e371fde6b5d26133
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 10708 bytes