Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6731c2243de08b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-15 11:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caf76fde090f1a917ea2997a33c0280f SHA-1: 52a0b8a6b970ac386c2294b4e76eceed17c7dc99 SHA-256: eb6731c2243de08b011862f49a3e02f2d260be1bc6c5f33bd17a8d1a9be6a8e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, often used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://binarbaidfabrication.com/public_html/userfiles/file/dunijire.pdf In PDF document text
    • http://arucax.am/user_images/file/nudabulisenofitapelexelo.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/32278262979.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/rokizet.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/gerebexomalo.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/xejediropowotug.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c82939d05---48006861040.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613512af49258---41782946433.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613687b88e380---xawosesiligumu.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/51160353926.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/82515323624.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/48978059872.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/82344321646.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/ratonu.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/42147016865.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/suxonap.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/66270375303.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/81871572742.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/60012288725.pdfIn PDF document text
    • http://deforma.it/userfiles/files/jijujus.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/miguf.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/485bd52ffaee8be2f6b5aad0394e362f/walezog.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/vitep.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/72880478423.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pinazorixirekadimulajazum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bitlife+apk+download+iosPDF 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_off0000b29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 15292 bytes
SHA-256: e67c82b0609970f9fe040c3c57fcb6335f322f778dbf17865bdb1f568f488699
font_01_sfnt_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 10624 bytes
SHA-256: 93ab3ced05ef653eb41b5d860e82b68648dfdf75959096aa3b86327a1caec724
font_02_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1