Malicious PDF — malware analysis report

Static analysis result for SHA-256 3364bb155b66f5d9…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 07:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00fa4ad55ac4a636897749660d983c2f SHA-1: f4cc5abf440ec9e7dacb9b26d19161c49e9bef7d SHA-256: 3364bb155b66f5d927334945aff5285a926022eceb6fdfc1590afa6e770ea03e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to external URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://finchamauto.com/pics/38696262934.pdf In PDF document text
    • http://we-women.de/default/files/uploads/file/41033427140.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614edc0744073---tebikexesewabor.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/dotekuvosekojajenosu.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buwojapimimopunidexuduge.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/99372037512.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/16790585591.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/laxuxegezader.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905010659.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210903_145240_167.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/79419837254.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/megetazijox.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d64947ac05c6a4864b1b99c2093bd6b4/pisajigesidu.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/fekirutajaninepopolanaka.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137f723da9fe---34343674586.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/79870786942.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/zejetuxebizu.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/gososafavodajul.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109261013561617.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/xekuvumomufigebukuni.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/32068911627.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/xabizem.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/bitabe.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/91723030582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=damn+vulnerable+android+appPDF 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_off0000aef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF3 14680 bytes
SHA-256: 52dde8313a01381b810227538776b62cdb091afb8839b1a28a253f41d2766287
font_01_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 10596 bytes
SHA-256: 44765fc7e565e5b89f61f0de481fe5a7259722c036aa4ec482dd8715cb756a76
font_02_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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