Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb09ac8432c22be…

MALICIOUS

PDF

115.0 KB Created: 2021-08-14 03:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 03b66ec0fb2c6a892c9a32efd3ea52f3 SHA-1: bce8d2a6bdd4b14e9582b29d7fbe5ef5092e5b70 SHA-256: ceb09ac8432c22bee828133c1e40d05eceb4376b6df160a46ab67d132a99d6a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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 http://orderbestwings.com/uploads/files/doxepuzivalakejosa.pdf In PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/330b1a248ce65c3393ebeffef30f6f15/lufenagumulemudawopa.pdfIn PDF document text
    • http://dakmet.pl/upload/69367295578.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ebb650eb3ce41be82c09af9e8f957067/jafedanokezapen.pdfIn PDF document text
    • http://hk-keber.de/images/file/fekadaxomakoxutemes.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/85524012717.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160816d0cdd359---mujopawagilonawu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/rugipaj.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/40f1ba8da286f7e5a82326e5e4834e34/88944044883.pdfIn PDF document text
    • https://asi-filter.pl/files/file/sorafedozapusefaderuk.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/891ca3ecd23136c508fd8c70788a9140/kozuliwadet.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/98131084427.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/i5pgmboa7v41cs85namcg7mm30/51469995483.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dkob3nadpc466rc42lugef8ko5/napakakunoku.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/8a96d7e472d442007bc5ca92979dc995/tesodadubusabavo.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/tisekuj.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985635e6cdf---43331719423.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/92f9ae09aab29f632ce64e81e3d94609/wewojijin.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/59274acf6f8e10439c3a4db361c929c9/pizov.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/dokazejanojid.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/kifasazero.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/polutenuzipejope.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/89093178613.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/zirazaxerilifuxe.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4542b8d97a5dc32760fe18f44855f490/44690532112.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/gadapavuwebiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=true+detective+season+1+episode+3+script+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_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9D 10920 bytes
SHA-256: 13b1594616f44f21b81f9ea90bde635fa7a4039e789ed1554ab3bd55cc3384e8
font_02_sfnt_off00016824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16824 20772 bytes
SHA-256: 094f11c33b58cd3d11d3f0f70b5d6f66d251d48bd0cf7cfb39c624c5ced54fcb
font_03_sfnt_off00018afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AFC 19304 bytes
SHA-256: f686677c668836f1d61198f36c885e044a5d2d8c20060d88c9e2b9bad1e6025d