Malicious PDF — malware analysis report

Static analysis result for SHA-256 031608fee5e9cab5…

MALICIOUS

PDF

93.2 KB Created: 2021-07-05 04:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de485bf08b49a5bc6d7042531d6de0e5 SHA-1: 70cd540748b94c6b1a085257e33b36203a2e3b19 SHA-256: 031608fee5e9cab56fe6b511f075f32cfa9088f25911ab9782544f325090f81f
164 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://elm3rad.comfile/wifodazosijufumitupobam.pdf In PDF document text
    • http://sammyuriasproperties.com/userfiles/files/76027374560.pdfIn PDF document text
    • http://waypl.pl/upload/File/mijuside.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/24319005166.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/wugoxezamuzazigilizere.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/18689017022.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/fojexawugalebakajapejudi.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/kisudikibanagurave.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ob2p2n1pk52ilip895e9t03gku/fugiralizojuzimozeturex.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/66215857511.pdfIn PDF document text
    • https://clove7.com/userfiles/file/gigeguwapibofa.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/71142045619.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/87237877869.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99deaf09f8---88129436137.pdfIn PDF document text
    • http://whatdwellswithin.com/file/20045454119.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/3952909780.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081954c1edea---39394572888.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/sanudufubaruwasuvenido.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/99872687724.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6db54adf55---dobelefamet.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e9383ea4---95475718100.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1667884966---38315921184.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb881b2b8---11426451374.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/41526173308.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc4036c33---sorakolafitubabut.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/88239374749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+play+apples+to+applesPDF 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_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 10380 bytes
SHA-256: 67d09f5717f0eee4d2e671243837e1c01dc7b94343292cb4fb05e08bf4d1875d
font_01_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 17588 bytes
SHA-256: 594179e01e5f21c459d22477b8ed6af4b149028adf26c6ad1903cc6e134ce9cf
font_02_sfnt_off00014f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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