Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4b76404bb5ad29…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 09:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aacca54b6069e836cd62f83e88585528 SHA-1: f16fa7c6b4abfd3281a9937a652927b7544f2154 SHA-256: 2a4b76404bb5ad295d6592e575c98ab9f49aedcd6816dfa6f33694c75e98b444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160871eda8c315---77727586643.pdf In PDF document text
    • https://juhaszautovill.hu/userfiles/file/sesepeferosowitu.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/waluxobezax.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5f2bfab3b065470f781d0c44bc34d40d/39958610871.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/kuvuvonenubi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/megikibedadoforosebepiv.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/65160377650.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4051f55224b27b927c646912194c7dc8/liguvopofobetarubabitut.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i86j9n6topf2j3e5n49sc40d8o/96945424305.pdfIn PDF document text
    • http://raczcsalad.hu/files/koralovuzeruxogezax.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b7a0672c02f08db5fdad5deed8a0a1a3/xikezuzenenesobopowilud.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/0pok00sd3h7eh45i5bu4u8lthi/49435432459.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e722f2c07---gimeninetoxufokumojumuxiw.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/wobotubozafa.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/13726079156.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/basujudi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7d8f62a5950e795512b90840f12f2261/waxeduxabubemurofiwudix.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072b83f598b5---xevawotixegikalesejedivab.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0d377e168ff5a9d595e80fd65a8f38f2/jopozirelisup.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00ce5ee1ba---5198451152.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/miwimetazasonofux.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/surowovimedodilikuko.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/losiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=things+to+do+in+montpelier+vtPDF 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_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 10704 bytes
SHA-256: 24890878df7e85d544d200da70303ef902e1908aa8d0c71893318fbbfbfa8e43
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 17400 bytes
SHA-256: f8b875641fa72863f901db1ff22dda0922f19c2b5c1814457acad1a65bce1202
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1