Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1683692f9bd46d4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 17:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b033cf3d6ac75c601bc4dd03dc7013fd SHA-1: f8825f35e82aa2d6fd6826b51a0bc9ea89dd73eb SHA-256: c1683692f9bd46d4b1dc10b2a50bb248b0174bb542f2b08fe7b165cc307cbb59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=aplicativo+android+para+baixar+videos+do+you+tube PDF link annotation
    • https://xn--fiqa735be48e.com/upload/files/bimivexexatogal.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xosonojuwo.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vaxisuvulofarudefo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ttdssupj8avq53qr4su7fqa7l4/zixuxonuninuxiponuvajiwam.pdfIn PDF document text
    • https://aedwea.com/upload/foto/21244042370.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7aaa55a2e2796b0177fc2328e729520f/nonoj.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/rafovibomopetoja.pdfIn PDF document text
    • https://sambelteri.com/contents/files/46041170651.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/jimimigazoxafuva.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/6410550129.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kivipifazezidilofotokopeg.pdfIn PDF document text
    • https://emmaushuis.org/pages/78684911835.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/mesedasoseweja.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161410b92331a2---nenanonulabowapapikesinuz.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/60599794450.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/katobutep.pdfIn PDF document text
    • https://nistd.in/userfiles/file/fisudiwetesobaxi.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/69617495710.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/65182d10e47620606b1b8cbe6b460e15/pemawetesuvibupoxopoleke.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/57868322807.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/lideb.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/wujip.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/lewazuf.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/28988719433.pdfIn PDF document text
    • 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_off0000bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 11012 bytes
SHA-256: 1d2b6e876b4260a8f81e4a7fec17cafb0b89b27846fbb963ded1ca26ec6e1012
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16848 bytes
SHA-256: cda60a1a91436822e210836181408d7a0cdbf8bbce98d0e318ffb090c8182ae4

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