Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d7d921611da704…

MALICIOUS

PDF

91.3 KB Created: 2021-09-04 00:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4bcf0aee0400f5418c864fff5a863c4d SHA-1: 4055354cfbc094ae98012bbad6f765914d5ff3a2 SHA-256: b9d7d921611da7042c5ad5a84190220a7c97c1b89a3704f7315a0b085fcef401
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lionsmarsala.it/userfiles/files/44680486700.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211240948068.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89d058ec0c---mapabugizofujomube.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/37405090633.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/66348372488.pdfIn PDF document text
    • https://ikima.fr/uploads/file/54471771583.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/xonegetu.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/88622434888.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9350012806ba2f33d0628df53ac3e513/34751926789.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zumetezazusuz.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/26336764266.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/pegotov.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/99cf7f8b2ad33f92b79a1a33bc0b2481/dubilekepivafilabe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994d15c34fc---zegagojavuki.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ad01024a---gikotusojov.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fa6cb533c4b954646dc28c4d426f9bd8/wipamojinetamiwigap.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/55987076903.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d64f31bff0fa9af342d9c69bbdbd8cce/wivuxavawop.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/ravurexe.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/204d4d0f4b621ad78d9b47ce474bfea1/9164332969.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/5455467186.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/manilabexawabu.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4cb7dab62da5f3b0c3067c8b219ee90e/82906972981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=economic+times+today%27s+paper+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 17280 bytes
SHA-256: 2b7c5a1d61a43177bb984a4b0032622206b3007ead89b6a29cef3e2641890b4d
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 17168 bytes
SHA-256: 72694db75cd9292203b3914030e6db37109d94d056d7699c0ef677ed0b773868
font_02_sfnt_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BE 10868 bytes
SHA-256: 1e2065a7adfa28f56c539fd3c8d049542674e5e97fd1f3768ad066888ccaa175