Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03d2cd5f7434639…

MALICIOUS

PDF

113.4 KB Created: 2021-08-02 01:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83cde6a55df875c7c889ef8b39c769a9 SHA-1: f8e8b64935b3ef4251ee542de01876fbb0960a5a SHA-256: b03d2cd5f743463951184d6fffac3e92fb2c69161f16c7a002854e5e68edab3c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or hosting potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://rumusjitu.com/contents//files/56669663153.pdf In PDF document text
    • http://angeladaniel.eu/uploads/files/barowagevepobinebali.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6e85e3cc08591b4a1c8bb794b59a9f60/46312063148.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/rajopofonorijurezom.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/47790160386.pdfIn PDF document text
    • http://bkmjg.com/images/upload/File/lalobajasutiwufutadugosaz.pdfIn PDF document text
    • https://altbuket.ru/files/49543631811.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/jifozewoxakavezu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932b819debf---85331945856.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/35462548916.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/73483407708.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079791126a90---17440506626.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3067b6de2---84138008347.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fb0522fc---bororabefilivu.pdfIn PDF document text
    • https://seikai.jp/free_images/files/7327598197.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15092760113.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/2990141655.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/926392bd5cd9d85faeb4eeaee2346268/40908680549.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c814jqh487c1790295n76bjm02/pajil.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a779c725932---53058662505.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062513091173499.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8ff594a50d97523380736d1cc9827931/ligesije.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/j9irenlfabh344p1t4qu6phqp5/juvirifufefulibavar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+law+of+electrostatic+force+worksheet+answers+physics+classroomPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 11000 bytes
SHA-256: b9003e1446c0c1f3cc49a3aa56ce19ce3ceba6509d03423bc7bd3fe4df62c57c
font_01_sfnt_off00014f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16744 16444 bytes
SHA-256: f7011256dfd9e34801f69d2693e76c89039e9cfd104953e82a75803c30fdc02c
font_03_sfnt_off00017e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E0C 21124 bytes
SHA-256: 5463c22c1f28b23fe60e1db098a165b9b91f08bdfcae6877df7462aaf2aae500

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