Malicious PDF — malware analysis report

Static analysis result for SHA-256 7423dac0230a70e4…

MALICIOUS

PDF

120.8 KB Created: 2021-08-17 03:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a883d5f12d28f9481548265bdb3b232 SHA-1: 0e1f7bc4de1f7df677303d38291ed2d3d6387d8a SHA-256: 7423dac0230a70e4dc5e74a95b3c8f3d9b4c5cc2dcd1a420efef5fe03d61fdf6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDF files. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to distribute further malicious content or phishing lures. No scripts were extracted, but the presence of numerous links to potentially compromised domains points to a distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb01e7ac519a2b2bce9cd83ba0bd6e21/wivezipafojir.pdf In PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/df335d15817bce723e632dbbca32fbd5/97808246384.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be8aa4b6aba---dagivapa.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/36371234202.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/69348519164.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/rowisojupaliru.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/busoxek.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6997fc9630---4660552892.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/19011453701.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/fabobobuzolenujube.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/pofisuduvezodemebefufa.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f63c1c13bed---modoti.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe2d6853c---tisezinosodijamexo.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/jevisafureziroduzarov.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/54803640897.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b30b8f27592b8d08631c1457fec29f76/jesadopiwuvimozolujav.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/16567351721.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vjueotcd82scu2vokh5vaop49u/fexupemodopipapikox.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9921aba95---4393307912.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091231b67ebf---44831115204.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/87648702532.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/m9pl59fbnrgrv88i8ujvoe5b4v/rotaxaruzaxotajobawiw.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/45950941837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=actividades+para+primer+grado+de+primaria+educacion+fisicaPDF 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_off00017365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17365 11064 bytes
SHA-256: e7c78283a91dc5657a967cc09b34a07bb3a9c8d499b20226550c04ca2e478a52
font_01_sfnt_off00018cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CFF 18320 bytes
SHA-256: 8e04c2dca161cf53b0be023022ecf05604e76ffd3b9ed91cffb1fd3732a3fb35
font_02_sfnt_off0001bb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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