Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d32279a6e5441f8…

MALICIOUS

PDF

78.1 KB Created: 2021-06-30 10:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89410b84ccdeca97195ff405cbe72a5e SHA-1: 858699946ee501919dae229311331ac7b7af6ca8 SHA-256: 8d32279a6e5441f8d13ea2793bb78c2da366164eac9b812e1bcbd7c0a60fa4f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many hosted on compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to redirect users to malicious sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=thermal+conductivity+of+rubber+tube+experiment
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/10758315443.pdf
    • https://artbynela.com/uploads/file/78747274847.pdf
    • http://norilskgu.ru/userfiles/file/71837631039.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/d1ive9nb7qeh12irb7aj345l3n/zevatadawudugin.pdf
    • http://www.asap-recruitment.net/upload/file/zejiripexusufuwogulilisu.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e5732d46bd357fdc91ae52e93a07c812/8862702803.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2431dcac8---vewokagi.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/01fae9c3881bbcb41eaa1924a8b0c605/94057164233.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3d7c5f54---xedan.pdf
    • http://jkphotocon.org/data/userfiles/files/86787021806.pdf
    • http://anchor-m.com/js/upload/files/beriwibaxagopo.pdf
    • http://school19-zav.ru/userfiles/file/fojirapuredefomoxu.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4606973c---65279507841.pdf
    • http://csc020.com/userfiles/file/20210611181428_3crpd5.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca68ef0c9---witogof.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bcf427157---87115295481.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7c23f3b4f0e9826442b07ab3ce8d1c67/gawubewaxovolotoraraxoze.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/suvbugab6qn72d8h6gb3pllum5/sirofarogonuzopuzisazuwid.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/079b3700a70d8ffa9b2822574cd1df00/37371822533.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5b2c42eed164fcb1cac24363fc5cfab6/megineleko.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b4ahu4mtf5mhgm3dpt96cs7hl3/4049652124.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c525b3edb9---talimafadefagu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5d41d9b2b4282295505cbbfd7c10636e/lunojuzolule.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6f2e4cdfbfaf81fb71f563de9b66b587/jujawivosavidawutasus.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a0e7cca9db6aba29a90f9f061794941e/gesit.pdf
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/91714417514.pdf
    • https://balaji-technology.com/userfiles/file/fiwipezodujamul.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1fa225763736471fd1769be7a763ffb7/47958039520.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_off0000cd46.bin
58e9b62ca834184be6a707e9f2335ddbbc349bd992289c07b598c3575ff4ab09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16612 bytes
font_01_sfnt_off0000f88c.bin
f3ddc7870ec8aa90d17cd638f0392383583717fd9dee2676e23db568d20ee980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 11204 bytes
font_02_sfnt_off00011261.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 16792 bytes

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