Malicious PDF — malware analysis report

Static analysis result for SHA-256 890aebfbe4187107…

MALICIOUS

PDF

82.8 KB Created: 2021-07-02 05:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 88e3aff65b299e336e1e859b6ec261ce SHA-1: b4c225a5f2e117b282726f8200f25d084f7edda8 SHA-256: 890aebfbe41871073071e00a8807fc94a45c2837e9d34c988302c4922632bfba
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. No scripts were extracted, but the structure and URL analysis point to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://beautyyaurient.com/editor_upload/file/51730263548.pdf In PDF document text
    • http://alibabashipping.com/userfiles/file/74957663902.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9f3c5c6a---zejozo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/dugutejepo.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210508211041.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/87207769763.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918df73a4e5---fitixiganuborakotijofupol.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/094db46fb2133e896b248ad941a29ea1/23463905029.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/44184832497.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/tivewejixutozixero.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1528f455bbe62d68329351e0239eae2f/21005224618.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3b111430---loberijemedu.pdfIn PDF document text
    • http://pi-consulting.ch/download/sijijakasenasif.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///jabuxaxavudebarazu.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/54535223796.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/d9655c6ef7a9be2b0fe8da458318b7f9/wosirog.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6u6l9c3rhufh0favj3aah2hhs3/vibugaxisa.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/joserixozewumexav.pdfIn PDF document text
    • http://lucann.com/Upload/file/woxijovuve.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/su052vd8f98fcl79hgd6m1r946/koxarif.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c850e0aea78---karolugubisofebakanigu.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/lupelemikiwubodomepoliru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+elements+of+design+arePDF 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_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 10764 bytes
SHA-256: e03b67f2264c27b8bfc0e6617c9550a9a2694d5c9d293ac7ebd1a393d8b77498
font_01_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 16392 bytes
SHA-256: ae8e8c1f2683a6f8666d0e73197801c51894f21845dc46c74e615010f1f8c988
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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