Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0eff99a470c4be…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 10:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 716c309e4469273c431aa8b4a45e3f3b SHA-1: 055edee30feb00bac82bf830281a0f975e138b52 SHA-256: 1e0eff99a470c4bef364153acd693c7baa96cfe36c71466f798d5853c858fe47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of links pointing to various disposable hosting domains, many of which are compromised CMS upload directories. This suggests the document is designed to host and distribute further malicious content, likely through a link farm that masquerades as search results for popular content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://yjbiotech.cn/upload/files/liwomafejikubud.pdf In PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/18082108617.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/51035589063.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/48947495670.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c67b3987---vazabiz.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/90767986355.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/35048479287.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/63342801311.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/mamiborewowaxexuwilaf.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b39851829---60532796767.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/86726530419.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/deborimo.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/lovazisuvad.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/82275137026.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/39325821266.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/vakemetuna.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wojipipo.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/40978923263.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c3dd7ef7---naforitojiputo.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/87157210051.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/pabugimusutenik.pdfIn PDF document text
    • http://ellev.fr/upload/files/98959551276.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/48321639020.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402fec18acd---73743171793.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/83163313265.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8ffd2e17---42532959693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gunjan+saxena+full+movie+download+worldfree4uPDF 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_off0000c1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FA 18096 bytes
SHA-256: e1f2a8bf08b4fea1a6200e6525243021d925b252f6755f1e3c0eb35390951a54
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 11020 bytes
SHA-256: dbc3cb30f0ff3cabf57dda1aa6c6092702b331a58b9e753f5d3d158c21aef824
font_02_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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