Malicious PDF — malware analysis report

Static analysis result for SHA-256 246453674862fbbc…

MALICIOUS

PDF

91.8 KB Created: 2021-08-13 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fb08192530a4649829d1b9182e60546 SHA-1: fb315b2f28d0cc60765e402229b6f7a2e449d9c5 SHA-256: 246453674862fbbcba586c9289c1a60357a93ee4102feb46dcd60d852f7be39f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are structured as link farms, potentially for SEO manipulation or to host phishing content. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • 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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/j9fbu1bqtsk6qqq0s2rj3r01in/14627170547.pdf
    • http://tantos.jp/js/upload/files/bunitoremokefirafini.pdf
    • http://2020kellyfamilyreunion.com/clients/1/1c/1c0e63424c3b5e20a3d858f77c59864f/File/64914106198.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b4b36bebe---diwilezizigisefumiladu.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7d352028bb5923a8fe3909caea279087/68470516097.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/u63up2nci23nlm1afr9vttjhj1/radomovunafofagalipilej.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084447527dba---buvilalafaxavazidemanamib.pdf
    • https://mszukam.pl/dat//file/22991622404.pdf
    • http://redactron.com/userfiles/file/suvapofuwolekivuro.pdf
    • https://toskov-yordanov.com/userfiles/file/49179551714.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d3751403---wedujanizutamokik.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/e00c5b72168a67b5c77ac5850abf4241/5315332478.pdf
    • https://horizontire.com/userfiles/file/73437406793.pdf
    • https://curewelldiabetes.com/userfiles/file/6049214136.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8456aec14---bimapuxezoradobav.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/32532799162.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0619f1799a---jilukagem.pdf
    • https://audreyheselmans.com/_files/file/487135924.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099153bc9263---32728088686.pdf
    • https://vestol.bg/files/file/liboxunamiwaxe.pdf
    • https://chilegastronomia.cl/uploads/userfiles/files/repevavakikefaxijirimaba.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f2ff4c1af994677f36fa7e0938d08ff/jagamupiwojexinulifexiv.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/xanexezatezojajaxi.pdf
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/97088391219.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/i1jv9qn6gdn2mbb3mshl69kdh9/judalenalubalowupevam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+unlimited+money+slime+rancher
    • 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_off0000fe3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 16792 bytes
font_01_sfnt_off00011651.bin
b6635c663cd9b75b2701b0fe1d40cdfa146ca510e1962dae068d3d106e6dd01c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 18348 bytes
font_02_sfnt_off00014646.bin
0d1d2b4803b882136bdacd5980ac66871c12141a950d568b2dfa1d0beac6a7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14646 11108 bytes