Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb48f17c0a36bcf5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 22:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b02cb2b483c40751e41854925fd712d SHA-1: 909e1c891d80ee497486e6a4f6e32409dc447022 SHA-256: cb48f17c0a36bcf5181cb9eb99a385d84c2b1d9f08ae3ccce011866a2996a463
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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 http://www.bluewhaleline.com/image/upload/File/62987756839.pdf In PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/wexulanegukotebof.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/54899052466.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/kazufig.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/4338434883.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613814263d624---76428491807.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/51959603790.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/xutobor.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/856b79cfe4e16b1a548032a3435ebaab/dusikagowitem.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/kefununefitebu.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/fopinuboberilasexukebiv.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/babowakikujezadajajako.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ch1vcq2fme5acn107399jo6p6l/71408592369.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd1a682ac---mogosafifofinufagiturew.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ac37c961---1099971307.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_E024136AABF5F36E.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/xakakuwemi.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/42205980354.pdfIn PDF document text
    • https://semut73.com/contents/files/nezekusanekuvanezufowozi.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/rizifinonedamalekodojo.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/momuvexosamupamelip.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/85247291039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=game+of+thrones+season+1+ep+1+fullPDF link annotation
    • 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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 17268 bytes
SHA-256: 57b60b915c9fdf1f1006fbe7eb672efb0b5ffde3a5f530a2abea55afa1bae540
font_01_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10720 bytes
SHA-256: dd0ff116d34f619e76c590ff724cd1827558f1b9abec41588d23d73102731ac4

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