Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae1156dbc8355fb…

MALICIOUS

PDF

70.1 KB Created: 2021-09-15 21:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9e50b332c651a20951a90c80e9ea090 SHA-1: 985d64f000265c5b0c374b85d25f24d94e8689ed SHA-256: cae1156dbc8355fbbb11e4a8f3cbf0ebe83c41b3e8bd7b6e850493eb47dedd22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JAVASCRIPT heuristic, which is a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings. The ClamAV detection and ML classifier further confirm its malicious nature, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/61654605396.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8796692c8---penim.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/madilagikoluzotefidod.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gonapegogetujamelitutul.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc0e56942---sedobawafogix.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/10811333417.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/28188344946.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee6c99550---29044111168.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/93f47e1bc5f0bc9f75d98c2f1fbb2b6a/91180642775.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/93392278437.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/ralilobutuboluzofik.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/47528464655.pdfIn PDF document text
    • http://fitviewer.com/files/file/sidizuk.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/8658363340.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/88492661190.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/zorigofi.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/nexitetatixemivukiw.pdfIn PDF document text
    • http://contelex.it/userfiles/files/28294971712.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/labamejiwavexijuxo.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/luzen.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/pisozeba.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/21377136296.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/guzajipofumowarako.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090518103467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=metal+slug+code+j+apk+download+for+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_off0000b0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 15480 bytes
SHA-256: b75c04528240513294e2ea1d461f2ef1def5a7fb38c7e62a3b7ba741af78ce88
font_02_sfnt_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 11196 bytes
SHA-256: 04f37de928e5fef1e3b8671ddb13ffdc79cd65bff8464deea1e3e0c53ca20f3e

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