Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee49e6b970e5cf98…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 09:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 709fc9e9e039dcb52b53d924348ee1f5 SHA-1: d21b9dcf06338c35b50db553a0fcdbdcd12709e3 SHA-256: ee49e6b970e5cf989b99b895dffc0c7c2c914d61a979e173a48de06447bd6b4d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics indicate the document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://a2kat.ru/userfiles/file/46453645312.pdf In PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/vuvafesenitazazu.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/31870006453.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///36726966191.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///nonirotetowo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572b0442de---6396688231.pdfIn PDF document text
    • http://posuni.com/userfiles/file/gomejaxad.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324b672bd1e---wasajelonajomadawosifanas.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/5308735532.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141383a77347---87322314660.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f991c651012d15e060191d60276775aa/65298895943.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/pelosasaririwitasowuvinoj.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/65763417437.pdfIn PDF document text
    • http://atomleasing.ru/media/File/labexodosonam.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/68952870616.pdfIn PDF document text
    • https://chv.vn/userfiles/file/vanegamujakanoga.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/11577677296.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/66606429206.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/jefujirime.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/43414515554.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a9f9b8769118946cf2d1f064d44daf8d/xabuveguxogopinufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adobe+reader+cracked+apkPDF 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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 19200 bytes
SHA-256: 2ef9faf0429e8d49acd6b59e7138024ffce33bad24b7e55d184b1290c3b97e64
font_02_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 10212 bytes
SHA-256: 50c96eefbfcdca2c3d08643592c4e9759bf4cbda0e8a5705457ced3d9cdc2c4f

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