Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c5780ea76d2f28…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 04:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5f6b38ae70e23c554dcace1fc0c9082 SHA-1: 42dbf9f3a68288fb275d718fab00d85e1014d14a SHA-256: d9c5780ea76d2f28b530733ae860aadf2892d727b1f74d59f78667908ce58869
172 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links to external PDFs, some hosted on compromised websites. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. The ClamAV detection confirms this sample is a known malicious PDF, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ww150002.linebot.net/upfile/files/20210906010204.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/dunegoroxuzirajufuzo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131567a6d6a1---36433747346.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/04e0bcc88e562905f7add198d74c8fc4/fugor.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/9004453907.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/xamixikofagisopevuser.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210908121014.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/98457107497.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/kijepusejupumikanid.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/72277052378.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/ruxibikijepot.pdfIn PDF document text
    • http://progetec.org/userfiles/files/22550375968.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/97f58a4a8ea1475f3ad6f2300ce356dd/19719200200.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwitelifen.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/ropuwajuwavumasuv.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/80502553727.pdfIn PDF document text
    • https://landi-bg.com/images/file/tepivinufiremekolo.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/34721746820.pdfIn PDF document text
    • http://sin-hua.org/userfiles/35780762740.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/tizoxiberoxuzuko.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613786c5d1a25---94244079248.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/filobugabamofa.pdfIn PDF document text
    • https://alutat.com/data/file/30702142793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+5+free+download+for+mobile+apkPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/58164931186.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 17656 bytes
SHA-256: 2c3606dbce507dbf2b8dcef165e6b45b40273617ab4569a2a4da9f261a0441be
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 10980 bytes
SHA-256: 6f091c28e6ef06de90627476b9914eaec572161cce7748e8b0488401921612f0

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