Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ae4230f856af7d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 14:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b34b66a3467d94e414b20fb2dbfe4fe SHA-1: f207819da45368c9ae95ccf76dd656357b3cd802 SHA-256: e6ae4230f856af7d023353f5bff9282dd25b6357e887338e6076b69586cf6e20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf47da1f0---wilurasokulujusap.pdf In PDF document text
    • http://kleinschadenexperte.com/userfiles/file/54494847501.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/9172717693.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/rozesedevelofaralota.pdfIn PDF document text
    • http://webbuilders.com/files/file/18945512607.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/depubasataxubuxix.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/setetepuwabobesizapu.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/nijefis.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/lisis.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a730d4e2dda761cce38ebb2db25a2392/1307412798.pdfIn PDF document text
    • http://bankerz.in/qpic/files/30005722989.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/82475514117.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613790743eebf---dalisopawisiti.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/sumarogubedekomanakutuwub.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/619bb52435ebb8032fcd6eecdd206dc7/muserat.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/46117213539.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/lesitepusuwuzux.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/demoxuvojip.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613700bb5cbce---temugenosefap.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/97477178288.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/79594126283.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/tixoxuzob.pdfIn PDF document text
    • http://wmsone.com/eimages/file/vapiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=woprime+dragon+city+hack+gemsPDF 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_off0000cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 11112 bytes
SHA-256: a253e98f0b869e475f5b76376911c1b08c399e428986b073a8e8e318c895fcce
font_01_sfnt_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 20928 bytes
SHA-256: 78cb1a9fab516fa05f6068b6084c650d6901b76d4cf8ed51ab2c67f020a32eb0
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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