Malicious PDF — malware analysis report

Static analysis result for SHA-256 01166ea7f0058cfe…

MALICIOUS

PDF

154.9 KB Created: 2021-07-02 12:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b659840973334b5be4f82d8742110a40 SHA-1: f42d1038f6a8c344eeb983d3b79af61fcb558298 SHA-256: 01166ea7f0058cfe57caff3db5bb5ff2d4b27bb30a3c6a18163584a5228b0f3c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests a social-engineering attack where the user is prompted to install a browser extension or update. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, likely serve as part of this lure or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://queure.ru/uplcv?utm_term=oath+administered+to+a+notary+public PDF link annotation
    • http://billedbutikken.dk/articlefiles/file/foxufomi.pdfIn PDF document text
    • https://x-software.cz/data/file/juxutu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ukjgubhpbne2t9to5h54ob4vec/felonabusozof.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ce47f2cfc---nukozuwena.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/41862950486.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041a2e72ee---49221784503.pdfIn PDF document text
    • http://capital96.com/userfiles/file/5212272180.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/7818781744.pdfIn PDF document text
    • http://geotersrl.it/file/nesifixosu.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/jofutavenapigivib.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/be47f8e087d87d4aa6fca0b31c121eee/25557808531.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/00u4e6mnhu80mqiv4obn5477sg/20360097187.pdfIn PDF document text
    • https://alutat.com/data/file/buxowujuwur.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7acfd9d6d---sigalufopanibomawumudo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5903e2379---23839146204.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e89728549---zapuvul.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/91077896551.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4f9780bfd---debobozizaxud.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021060111135473499.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620777297.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/54626352235.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00024577.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x24577 16852 bytes
SHA-256: 51f759539ded29aada3f7f72fe377a19c1bcb521ed55937c691eb41ca2505866
font_00_sfnt_off0001e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E378 18436 bytes
SHA-256: cbb40de3644faf3711ccf0f0372cc1064a5a99158c3971376ddb5047ee3db466
font_01_sfnt_off000213b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22BC8 11160 bytes
SHA-256: 43cb1fea9e79fddca36e154d110e8f5d48b6f5558856c8678af839816039086e

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