Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b64cb9a3af60a19…

MALICIOUS

PDF

81.1 KB Created: 2021-10-14 13:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05270ccd77ba302218dd7f02ceef59c9 SHA-1: fa99805429082e21311c63cd656630f9153b4c23 SHA-256: 8b64cb9a3af60a19ab8d9f6d5a60bc4a28e4baac8076e8f8599c599692cd70f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns that leverage link farms to distribute malware or lead users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=how+to+do+hard+reset+iphone+7 PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161396b4f4f828---javiraniputibom.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/76268601768.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/fubalimibixonafuzik.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/dexijorosef.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/dedafetadapufirulumepikag.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/64948450698.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/norigodefef.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/kotimezizij.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/parazedonunijebaxawumutex.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/pazutimagetokideniwixo.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/zuketugebitezuton.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/wigijifikifojowemavi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe8438dab1---botelerotunotiseruxufas.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9ce383e0---labavis.pdfIn PDF document text
    • https://lorrainezammit.com/files/file/15803299184.pdfIn PDF document text
    • https://castel.ro/userfiles/file/sorel.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/742ea1be727a619008497e8d4cff5dbb/57913228496.pdfIn PDF document text
    • https://mangallagn.com/images/file/punomuxisizejaruwetosi.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20211002140941.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202110102151091509.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161d0cfd2d88.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/60634035212.pdfIn PDF document text
    • http://only-svet.ru/upload/files/nowadibubivikagakuxu.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/67059873480.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_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 10572 bytes
SHA-256: 112e4aae2d4252690a19d01cc76ba2be02e23d1534eb843239e380cd2ee140e5
font_01_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 19048 bytes
SHA-256: 265ca2a038ed895e8481efdce79dd4d9d18ade399ec2a9aab3498f754fa4d71f

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