Malicious PDF — malware analysis report

Static analysis result for SHA-256 e858d42d621c4765…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 15:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b37d432db0fd3375743c3b9934f43ec7 SHA-1: a65360d8274f0558e6fddf44cb96111b98511663 SHA-256: e858d42d621c47657863eebc9be64d24c76122795dab0bdb8d94a14f979777ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/3625401378.pdf In PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/92105792782.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8091a3c6c---40921227064.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/sunavilisubakamovuvotud.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/dixuxoxifire.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/44300787008.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/23415490359.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/62143941970.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160842fca17df2---62290025269.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/wovavidis.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b803a2b02---potaxumekivumegapazave.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/47205973640.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/batuwafotabawimaju.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/748bb4c25bc71a3badea8d6ed51e7ee5/gukujifebozitubosolivuna.pdfIn PDF document text
    • http://boldogelet.hu/media/35508852661.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/makexoxovavovanasuz.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/833d4c3bec997be2fc96e31626d4c2b0/54828340880.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zunivuz.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/kilujisekurasikawajajexug.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/46585308989.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fisofusomaxaxa.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160853e27f2323---zomufodoguwofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=manual+de+instrucciones+seat+ibiza+2001PDF 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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 18224 bytes
SHA-256: 4f27088efcb54e4900b6bed946daec40ac99ace78a580dc03bd5f2b5a7832076
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 10952 bytes
SHA-256: 64ee5f04aaf06be153d068b46d6d06390125b74a0715b26690eb3c60a7bbcdef
font_02_sfnt_off000121bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1