Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9f8df670d63661…

MALICIOUS

PDF

89.8 KB Created: 2021-09-18 18:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 291568132c4b586d22ff1415f98206ba SHA-1: 0bf0b5dc2eaf1c8d4f9f9dbf6bf430ed7168c81b SHA-256: cc9f8df670d63661c7b01a1ec6a323fe4711db124d758fa97c69055393b1f994
224 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, suggesting malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates a social engineering tactic to prompt the user to install a browser extension or update. ClamAV also detected this file as a 'Pdf.Phishing.Trojan'. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tidymoney.com/ckfinder/userfiles/files/35286194557.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454ac9e78d6---guxebi.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/38666087701.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614412284d790---lunevunixiro.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jujosezelotimexegere.pdfPDF link annotation
    • https://samsungdvm.net/upload/ckfinder/files/73718590815.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/xuvag.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210914033059.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/36008122034.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613cee1c2fc15---giduxilukamawovatuwiki.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/33425290558.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/rezumelu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/fasenupomijuw.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/37012493258.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/netixo.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/64587446160.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413afc3ee3e---wubaliduluparelorojifus.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xagagudipiberatag.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fhp2vs3eks9fmr5cp35k2587v/39785226663.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f47d85da6df1a561d0880dba59c66938/lapemeraroj.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/lotodonafasuxamodifeneg.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/sududere.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/nukegobomi.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/mutisomonavurixe.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/ravotosowepakexumowogameg.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/78480687619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=browsec+chrome+androidPDF link annotation
    • 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_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 10628 bytes
SHA-256: d3670c4d5963d2a61045480d65e0e93f370abcbbda41fdba7da7ab281dfc1db4
font_01_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 18104 bytes
SHA-256: 36e7ff733c64fb3483cd0a8c0500213a855f9115ee73e050cdbfcd6465c1f116
font_02_sfnt_off00014152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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