Malicious PDF — malware analysis report

Static analysis result for SHA-256 7813b639398dcffd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 08:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00715a1931090f66f0112466914e5167 SHA-1: dc46c6b3e05a5dc2579d8802db60d8c30e25c0b6 SHA-256: 7813b639398dcffda3f93560dd7f8b247feaa5fa0180de6a27935b8f0407a774
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://mobitransjogja.com/files/91367221921.pdf In PDF document text
    • http://qapoll.com/2015/vat/upload/files/54302289059.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/dewefogemilobop.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/tadajofanipubux.pdfIn PDF document text
    • http://videocycling.info/files/file/83234149355.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6025e726a0e77d5d77aa11c0e27d75a0/71239462537.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/66309960650.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dekufelasoxufeva.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13211256427.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613058ae0ee75---kitotuwi.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/9110386385.pdfIn PDF document text
    • http://domario.ru/userfiles/file/tifipebojisapejov.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/foparovonoropomupivivetu.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/tibugak.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/83695621447.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/rapenadudifinadujexi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e260340e---wagadibuguragimifi.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/pedawukes.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/gojutaxaguxined.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/0e9f8f5bb6a6722fd05d3bea883d3bad/nutaxuto.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/dimuva.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/21282340773.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/suleturomuxusufamime.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/40510341165.pdfIn PDF document text
    • https://zzwgjx.com/d/files/29160707644.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210925013009.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pibubusal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+first+derivative+test+calculatorPDF 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_off0000b692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB692 10596 bytes
SHA-256: 929244f9df3a39eb52628e4934259803c4bdc8ab6ee766530e4b2a42dd56ca91
font_01_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 14892 bytes
SHA-256: 2e5485ae10eba0e7cc0ba1c73c3204641ef03d65d8ff0f2acf8f66e25467f27d
font_02_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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