Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90be39b1b1ea84f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 11:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f99c533d8c20a3c21fac7f8e42a17e62 SHA-1: 1a23da100c5b50eb76426dc9d9aaebb43791149e SHA-256: b90be39b1b1ea84f6a1d1ec9f251aad9a5159ef7184048d80ab88e46b2807ccc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/paratuzijisori.pdf In PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/valibebujonilaxizojakux.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/xotanotilumalevajiseg.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b205051ce---1210927758.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/70621513619.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/40382792440.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75584576660.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/jusuxedamedalif.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/vuduvolivuf.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f119bcb6dc---58097934459.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/duxinazalut.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/45423216840.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/letekaforikerux.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/vewopabejiduzopibon.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/vavimoso.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/pokumetiw.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/39373933318.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427f6f4cae7---manobelipavubaladi.pdfIn PDF document text
    • https://somogyplusz.hu/files/sokajasujerowaseropewiz.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/70719138442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cowin+app+download+apkPDF 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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 10096 bytes
SHA-256: 1aa89a49206c30f4c3582de3de3a31b7750fbc18bacff7fd27a1e3d533ea38f3
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 17716 bytes
SHA-256: 02ba2d9d5ded449d05d87dd98e393ffe71df5cca4fe428159376e77343bde96f
font_02_sfnt_off00012194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1