Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fda8d533c61506…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 18:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86e66787498062815c7d8ac1451a4dc3 SHA-1: d7538032f49648808f64ce170ed1361297cb0149 SHA-256: 30fda8d533c6150635bbe7daa5715b86e326e83ce638c9c0da08a4830cc83d31
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm indicators suggests an attempt to manipulate search engine results or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.espace-hotelier.com/ckfinder/userfiles/files/murigekaxonaxulip.pdf In PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/36642884540.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/deruxukozirov.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/68101277397.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/18193549715.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/kilowakokuragunolasax.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/55033933921.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/18044340535.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/fugomoleterorujulun.pdfIn PDF document text
    • http://didopack.com/files/pajoketizewa.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/53130846994.pdfIn PDF document text
    • http://hflchw.com/upload/file/magejajolafef.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613add678b4da---28311467656.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b69932a62---dapujigexurefi.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d1701a3a---ludamibugomanawegusu.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40195640059.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/monakaposupokavapojidu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/9761c63910791d7c846455fb73b1fda3/50401576183.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/jopizipodap.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613640bf96dd4---rogotuveminixatutukuwo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/3153466854.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/kaposor.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fubanulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=flash+led+light+for+notifications+androidPDF 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_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 10732 bytes
SHA-256: 94e2bd0105139fe9262d60a173bba7de7ca68495f7a1b0ec1984d4cdf93084e4
font_01_sfnt_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 17200 bytes
SHA-256: 1f9c3ce331595abaee651d5db803cf48625a67920ea0c5b9d30c9fecc7350beb
font_02_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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