Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bcd962653abe860…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 17:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6572238c9c7834ef066e54fc8d0aa78b SHA-1: ae29759c723a8aa9883911147d8173a9db3783e1 SHA-256: 7bcd962653abe8608d89eb1d280fa277630084e9eb9363638efdbde94158ea52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of multiple external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stl-log.com/htdocs/cljr/data/files/54238302488.pdf In PDF document text
    • https://giolog.biz/images/bulk_images/files/82010693827.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/92223054022.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1f76c3d90---kimijededafokekonipizuron.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2cd028e6b07fa72dfd0b175c3c5c35c1/rugepotapoviponegojara.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/dasowafenaroxokol.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb3644c2d---35972159998.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nibotezagofodofo.pdfIn PDF document text
    • http://szpk.hu/_user/file/3553331141.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc6314a27---55845372967.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db60d78ade---16729154865.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8673ccd82a---82716133684.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/fd4518800b530b7ff4e1838ff993752d/ripipibagubijexo.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/72821221645.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0652e175b5---5019047877.pdfIn PDF document text
    • https://wonkingchina.com/d/files/82222438539.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2461b8f61---17584416262.pdfIn PDF document text
    • https://southafricapools.com/contents/files/55270226134.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/80087508421.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/zefadob.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7008e5385---31567016101.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/60000694920.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/71671725133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=cfa+level+1+book+3+pdf+free+downloadPDF 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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 17640 bytes
SHA-256: 66fc66e1c2966bb71a8063b4510318ae6546db8ca419873893df22b82de40eee
font_01_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 10772 bytes
SHA-256: e18c70f433d107ad9eb6759fe3e3f6baa80279ce2408ed91a0bb69570218c817
font_02_sfnt_off00012c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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