Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1fabbf1a85463b…

MALICIOUS

PDF

90.4 KB Created: 2021-08-18 10:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cb9bc2a8535418c0615f6372601b710f SHA-1: 1dc5aac49cb162facb881832e0b9d366e9c3f6f4 SHA-256: 4b1fabbf1a85463b74d2b6bec2ee64db89e5200a0875eded36056faa6c057951
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, designed to lure users with SEO-optimized terms like 'war thunder golden eagles hack'. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=war+thunder+golden+eagles+hack+no+human+verification PDF link annotation
    • http://anhuishangbiao.com/upload_fck/file/2021-7-18/20210718174946811474.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/ketutonitekeguwazebu.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tvbp6qissli7lkiu8ogerq1bfa/lumizoxuzix.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/kezalumagasadapafo.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/38000690107.pdfIn PDF document text
    • https://123natura.com/stockages/files/92236378751.pdfIn PDF document text
    • https://isleo.com/i_photos/file/58604916929.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bq8va4sc0ht07jl6hjct56tp47/mozesipasubu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/7692233168.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/71648793178.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/gataxexeturibumow.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/difekude.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/31271174866.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/33756167814.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/93018949770.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/junarogikomupefaruneji.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/31765147491.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c4bbcba21---nuwut.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082f12aa9fbc---barixuweziz.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/nuvabedaxexutu.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/9170769860.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/26b496c1d35007aa85cf78ec6d8a876b/19317194944.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/82043566475.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c5a3b4a7200d42cbe756fbb2ec9f27fa/96107277825.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2ebb58e24b5bad8f711672bcddca4a2/luperosili.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_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 11172 bytes
SHA-256: 94231d033139495d0a397409449fd74d445e22347199311858d4c70116850265
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 18596 bytes
SHA-256: 6d0edcdb30179fe1647e5e97141a28d09b92f1e0b629580c27e8a081e548c086
font_02_sfnt_off000142a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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