Malicious PDF — malware analysis report

Static analysis result for SHA-256 164ef11b1050b541…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 12:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7891749bbcefcff3d84fc0e415633f2 SHA-1: 18ee9240b812fc5ef7ce5b0faedd65f7545d8497 SHA-256: 164ef11b1050b54165283bc1cd574a6f063ee06fc449f9eb8d92c6426071d144
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of numerous links on potentially disposable or compromised hosting suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://oxigensupplies.com/shipinc/userfiles/files/dilatalupalejud.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/felazeliratuzatukekoxek.pdf
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/40914445557.pdf
    • http://sicilalluminio.it/userfiles/files/mezorepub.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/terededomavikebis.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210909_030917.pdf
    • http://inspiredindianfoundation.org/uploads/wolero.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147417391ec4---kuwezajunudupeta.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140595a3cf5f---58240960344.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/62264302381.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/dijalapuzutakizoraxojoza.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a0bd7c074194584ba3372b900c8a319a/gorexemag.pdf
    • http://matraholding.hu/images/userfiles/files/31029773259.pdf
    • http://peterpan1996.it/userfiles/files/fevase.pdf
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/xewabofez.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/kefatixoma.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148529e5fd76---rerowelulafejelomuralegox.pdf
    • https://aglogistics-bo.net/userfiles/file/96812668803.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1db02fabb33edfc142ff45f4df9f7ec9/gobaw.pdf
    • http://bancasemecanino.com/userfiles/files/takigawojoli.pdf
    • http://mobilenmr.com/files/files/47080799461.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/89246474084.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=life+after+beth+watch+online
    • 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_off0000d17f.bin
b282d60ceb90c94fd03d9edd969797b34affc1c4e33549fcef0114348c5e2e58
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 10448 bytes
font_01_sfnt_off0000e934.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE934 16792 bytes
font_02_sfnt_off00010146.bin
9191bdc11e2b39d6b34d28cb332cdd0f44f3553e9cfa378ac15bfbb698030dd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 17652 bytes