Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b49e561ff4bfc…

MALICIOUS

PDF

79.6 KB Created: 2021-06-28 20:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24888a605a1b322d6df8bdb2b3b2f12d SHA-1: 7d544b3bd34bdbfb9fd79419e4e0aec60d8bbc21 SHA-256: 9b7b49e561ff4bfca70ddc8a181cddaa04398e1fb956cdb7c12ac61271d090c2
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated high maliciousness. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL analysis strongly indicate a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://agermag.ro/mm/file/xirapexumejazali.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088f101a5e0f---66372697325.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3e4a7faba9ae5a3ffd081d121a9f3db8/861657540.pdf
    • https://hoangnhataudio.vn/media/files/mezaxanezopilababu.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b8133dc5---moxilom.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5c8e9ead35f5e0f4df3be48a64dd710d/butivenagutenunalupuj.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607049809b8d2---10742416529.pdf
    • http://www.cddfct.com/up_files/file/digunuraxalumuledu.pdf
    • http://www.radanhorse.com/resource/files/rutepupawemulomerukedor.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ls89ic833rfu75l1jkbf2ok534/zamujubeka.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81770908d---83230032233.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9fa199885053a398d32c2c524a468795/jenidopuzulavuxukem.pdf
    • https://lawina-radom.pl/files/file/40058829507.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/re1d8idu5bh20oi0u373gvnuon/woberexijef.pdf
    • https://nepalonetours.com/userfiles/files/vofubekevikonawime.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f4ebd2d06---rowijalopunifu.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4001ff5f---samumezatanorigubejis.pdf
    • http://lindseyderence.com/userfiles/files/85341597743.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9193a5429f---71335817567.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/i07acia5g9h1f53bjuid74576o/bufiruzotev.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a2f295b8946eb751d93dff504a96e8a/dobovedokekifogenibisev.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ecddcbb0---mozaxifowirozunofikuka.pdf
    • http://hiro-seiko.com/upload/files/visobanelanurezuxefanow.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d87762ef3688c58b66340813c58422ed/35189909653.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=find+the+linear+function
    • 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_off0000d62b.bin
259b691d9d89d152407532aacebffb460061da31acee90d615e20d1b21a10420
pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16756 bytes
font_01_sfnt_off00010142.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 16792 bytes
font_02_sfnt_off00011959.bin
67a56d9ba050c003979bb07f22c160bbc2db538464ba773cd95b0ae0bf33c232
pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 10484 bytes