Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bdfb1085338e4a…

MALICIOUS

PDF

80.9 KB Created: 2021-07-29 17:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 539cb714a197b6acb4045b19bb78ff8b SHA-1: bbff4c6bc9003a32292ab211e0e58ac5a5497c8c SHA-256: 99bdfb1085338e4a11a19887c180cc116c80967716a2dbd87c573b8973c828a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDFs. Additionally, it features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of JavaScript indicates an intent to exploit vulnerabilities or perform malicious actions upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce9bbe78d---67631024176.pdf In PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/72258578107.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5194cc054f5373b5f8610f028371dbbd/25151012115.pdfIn PDF document text
    • http://trevorhannant.com/xijigutonulumaromep.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/dabevepamofopo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dclphoppfo64m8sbu5fmtskdi5/54778040472.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jimitupikuvipomorupevipu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/v61dsi68fb24vrlqd4tgsf5bs3/wupelexivagido.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/97893101629.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/514642215.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607217fae0b43---14091325542.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/8716597532.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba783dcf7f4---magelosunumopoxulotediwal.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/gowejevinezirax.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ladojomisufojokiv.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/tejowitufexamo.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/50101436f288f9ae8615f74201e466a0/vamipop.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/042015275462.pdfIn PDF document text
    • http://mesterek.net/tmp/guzozawa.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/65630738158.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/sadutifofoxafi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eb7d6a1c5---26719284539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=playtex+diaper+genie+instructions+videoPDF 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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 11072 bytes
SHA-256: 9bbb1f3bdc04a6475e7c828a59a323667eda249ea92d3aa5f0b21944491dfbce
font_02_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 17304 bytes
SHA-256: 894ba5df35964e329038bbb748d710bdc09245263abc3af8d82e7abb607b00f7

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