Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81e9db6a78964b0…

MALICIOUS

PDF

68.5 KB Created: 2021-09-23 05:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1057d6f01eee4924b95f3ce8be12bf4 SHA-1: 24e87e3a7927c74bde76d522053296fd9d842847 SHA-256: e81e9db6a78964b0393b995a95479ab81cf9d74f1b7b42caaca9c6bf8271a7cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. The presence of multiple URLs, including those on compromised CMS uploads, suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=psiphon+vpn+turbo+vpn PDF link annotation
    • https://ienter.bg/files/65143650428.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/91647872920.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210918105623.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bffa0031---bifizuziregedipis.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb551ead3---59862327615.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/18126139559.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/37091450549.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/tedozijegop.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/20582599826.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/logukarilus.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/3983271965.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/35136426124.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/musepabokigizalizitij.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/puvawajizabe.pdfIn PDF document text
    • http://chinazzjx.com/d/files/17464631006.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/52226897095.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/83746351697.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/38094980284.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4d831aa41943c239de19a56075764f6f/jenusofevakom.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/tedabap.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091107041655.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdac609b67---zolajexururajoxelav.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/88378596005.pdfIn PDF document text
    • 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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 14704 bytes
SHA-256: cfdbe4990aebce21e7a7254e9cef7de8b706bf468f668b796861016a0b5eff3f
font_02_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 10316 bytes
SHA-256: de5087d1c868a5cf2a9a48a4678286ce1086b5cb455d6dd06dc34013a4675aa5

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