Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b3c609152d1295…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 00:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53a584c0fef71f266a3a5edd417bc168 SHA-1: 4c2f5fe75e90f14d40e7fb9739c3c58d88ace2b0 SHA-256: 66b3c609152d12958c15e9d0202b2317f8833f49ae120814c872577e8147fad0
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document is designed to trick users into installing malicious software by masquerading as a necessary browser update or extension. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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
  • 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://inwebjor.ru/uplcv?utm_term=how+to+print+from+android+chrome PDF link annotation
    • https://listocrm.com/userfiles/files/7153169525.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e5cb56ae---kugomokajudesivunej.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/mosix.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/piluxikitoliba.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14c5a424b---kuvejemavivufusezowun.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb748a664---63312144633.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/widaribe.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/tudipevotukarar.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/47654389865.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/72822956724.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/88888942106.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/25183352664.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/95310214805.pdfIn PDF document text
    • http://santabruna.cl/upload/file/vozuboji.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db18ada083---tusuroz.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/65025902903.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/xumitukewal.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vokugoxisisukaxap.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/95136534287.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/7460346112.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/15961337880.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/kimuguxiwetobib.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/16036895344.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 10748 bytes
SHA-256: a6668a66891cd08ac7db1ef1ab996156adc52511afc3cf9efa587534a0989931
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 17536 bytes
SHA-256: 8ce1adc8f16c6eec11c33558c79ddd0faa69e54af5f8e522d36b8a0614720fda

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