Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2c426fcd470140…

MALICIOUS

PDF

85.6 KB Created: 2021-07-20 20:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32da418ec60e5c7c02c7b560666705a7 SHA-1: 2adcfe7b5fdc81728c429e2d7928a52d6de65c1e SHA-256: 0e2c426fcd470140f4033cc2b1a3a1efbdce396581a36939b39297bb3448fdf1
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine rankings or distribute malicious content through these links. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b1359f68a---76564100571.pdf In PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d1aa4c4c---31041486603.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/letudiw.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210712_0BB45CF31312DFE3.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/71966394057.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afd503c2e40---31174977573.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160729ba836d29---19042591919.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f7272e94---80883596756.pdfIn PDF document text
    • http://muszempilla.com/files/file/rugodanolet.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/zaperakimekurumutuxa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c732b038b---bagoxugewu.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f036a76bb8---vojuzita.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/68be8a3618bcf2a18bcac5e4792990e9/pokukajoxopitemexowiruf.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725138ddc4c---limitivinimajitunamube.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/kekukaxevoniregoxuso.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2800c583f8---mopod.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa2a9e2f1b---40237961353.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/dopexodefepenudowudewulo.pdfIn PDF document text
    • http://siembra.me/uploads/files/57099371707.pdfIn PDF document text
    • https://maturana.cl/upload/file/46658747002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=front+facing+car+seat+illinoisPDF 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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 10488 bytes
SHA-256: bd0bb9ad4f06cddef94ad42cde83072b320b0b569fab9b6252e668c1822689da
font_02_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 16176 bytes
SHA-256: f9558edaf6988e9a0edd0f2646989f517b722c39fafc2615c40f63560459b988

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