Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb0384fb465c4bc…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 03:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68146615da0b5370e69cc30e1edca5f0 SHA-1: 0778c74e908972d740f9f59a7778141b0d619d23 SHA-256: fbb0384fb465c4bcc1e8528b80bb24e3a399bc58c6d0255056657337fc30c07a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm for SEO manipulation or malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://446888.top/userfiles/file/kigedumir.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/mavinulivabarebamebonamef.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/53536918022.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/1639106085.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/95643533109.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/mikefim.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/gamux.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/samaniwolagaxudujag.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/dawasaxomojexite.pdfIn PDF document text
    • https://geloracinta.com/contents/files/42233689228.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/77668222905.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf979992bc---252857077.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/budafurojivazude.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/jevukabijuxuv.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1c251e66---keposa.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/tazoratamubaruzex.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/57790787525.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/kulerebeg.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/bopimaragemudilum.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/85894134208.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/98504341315.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/gemiseli.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f43566fcaa87a2acf03c379073169271/17493547762.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4fd439a00---36652728007.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/81733348451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=plants+vs+zombies+2+apk+unlimited+everythingPDF 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_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 18752 bytes
SHA-256: 234f2bd7c0bf1d0e4e153b1bb311530bd47dc32dd0d5b7aef5d0e9850b7ebb8e
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 11532 bytes
SHA-256: 4ebbc7cae509156b153004ed924bd2af0488df0ef778feac0fda25b3c3bdc27f