Malicious PDF — malware analysis report

Static analysis result for SHA-256 a730e34b71e2f439…

MALICIOUS

PDF

71.3 KB Created: 2021-09-22 19:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2cdaa3e00c05a58c2901aae39e07b918 SHA-1: ef3854485f354d59e6b1db61bf522fce0fbcac8a SHA-256: a730e34b71e2f439f3e48c36a1a19e8f806ac4a1004943bb4a5bb647484aebef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=gift+code+minecraft+java+edition+free PDF link annotation
    • https://85097781.com/upload/files/xowifami.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/bovukut.pdfIn PDF document text
    • https://filetorme.com/upload/files/zupaluzutori.pdfIn PDF document text
    • http://webhoctot.com/app/webroot/uploads/files/xufisuxilisaw.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbf634381---lepip.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/boluparo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ab4ae6794de4f2276c1a1f44c160846/ruposeroxorelid.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210913001807_60grak.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/3313710303.pdfIn PDF document text
    • http://irths.com/upload_files/files/29721364219.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/nosezus.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/19767442836.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/sabopuzedepol.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/94287747160.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/volozixijawume.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/44607654416.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/72554427302.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/wevemo.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/vekuji.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/29e5cc218c3b11c24cc81f5e29e6a512/56725448094.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/siwuvolafomegitadijolexo.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/47673352245.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/mexopojubagonogoranepovi.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/doburupepi.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/95518148573.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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 15344 bytes
SHA-256: ea532821fae803f1c4d6472a9710045673346dc65d7cf735ddfbd4edab38c12d
font_01_sfnt_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10660 bytes
SHA-256: e05e5fe2b1e7c2ad917f06b7f939d42539fbc0dc711de52bc49097a3d7d4d645

Open this report in the interactive analyzer, or submit your own file for analysis.