Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c267923deacb93b…

MALICIOUS

PDF

104.8 KB Created: 2021-09-14 07:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6349c22f4b2e9a948522887319a32c0 SHA-1: ea0130390e5d6c583112b6d694ee40b612ccb8d6 SHA-256: 3c267923deacb93b0b3b9fb38fed16f4a134d52273607cf1cad459d50ae17d06
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be part of a link farm designed for SEO manipulation or to host further malicious content. The presence of a 'Fake CAPTCHA' heuristic indicates a social engineering attempt to trick the user into performing an action. The document also includes a 'Password-protected archive handoff' lure, suggesting it may be part of a multi-stage attack where the password is provided to decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=fortnite+cheats+free PDF link annotation
    • http://aotwresort.info/ckfinder/userfiles/files/denaguj.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613fadcc9399a---wuwukovavizasikoxobaf.pdfIn PDF document text
    • https://phukienbep.net/media/files/27451622124.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/86786748479.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61695176544.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/44355823691.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/21559657745.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/zuvewofumiselex.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210903_125652.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k6cqdd9t0or2mrul8jqc3vthhu/nomonuxarapipazataje.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613add08f071e---wized.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/39998534663.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/vegepajas.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/nelemumilorufusibu.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/5684914098.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613def2f554be---29653434422.pdfIn PDF document text
    • http://fkhd.cz/data/img/loxavasapataxawomukiven.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/pojerijitumurivavov.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/1630426089.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kejurufuxolur.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/21662460241.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/ganizexudufurufewovexeg.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/68519755551.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_off00012ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 10364 bytes
SHA-256: e408474a898bcbec4ba6acc8aa319665bd619e42ba89247ca4ba1f281cf2e88c
font_01_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D42 20904 bytes
SHA-256: d57e1f337037214113f90588fb57eb63505374b1fd291551ebd622bbf91dab2e

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