Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb14e45dfef626d6…

MALICIOUS

PDF

114.4 KB Created: 2021-09-21 13:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 886df7af06fa9ac40baf088f280d0ba1 SHA-1: e3dd39680a5bb0ad17388018a673c1bbd8cdc6d3 SHA-256: cb14e45dfef626d6fa9b0061007c35555289a0aa591dd3d2cbb5501f9eb8f5eb
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or update. The embedded URLs and link farms point to various compromised or disposable hosting sites, likely serving as landing pages or download locations for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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
  • 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://cructi.ru/uplcv?utm_term=windows+10+update+version+1909 PDF link annotation
    • http://greenld.com/userfiles/78746174478.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300d474529a---zijibuxetelega.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/87851636507.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/4226552373.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/1317888377.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/gomajosokebum.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161411d86764e2---lowatepelosagivasujude.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/kemokonefuvavojivukawuwom.pdfIn PDF document text
    • http://special-pharma.com/upload/files/46335238784.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/roxewitubelowawebekom.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613de168a1317---58825250726.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/vatawedewatole.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/xarewuzovevatalufididoter.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/detilas.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/51720808633.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/10113139413.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025de48339---36043131847.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nutifisa.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/26607275055.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/10345456426.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dj14jlaevo2sea28hogluh4jpm/89050179593.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/32829975961.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/efdceac59eb752fe10ab6a5ace7aefb6/miwezenulibogalinepovaba.pdfIn PDF document text
    • http://ktcz.eu/files/files/85537410145.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/xazijofesipumitupumezopud.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_off00015acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172DF 18156 bytes
SHA-256: 28e0ea2ccfdd3917f662c831e763452624374367a215942beb823fa77915a4f5
font_02_sfnt_off0001a17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A17F 10924 bytes
SHA-256: b4a8eb2fddf85a40b1992b031ae82e86df7b85b0028872769cdb850ad87698c8

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