Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc904f1693687d2…

MALICIOUS

PDF

89.3 KB Created: 2021-09-05 13:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4af9722faee12e593665eb90c048eabd SHA-1: d3bfb4b927fa076719dc1c2c1ddca3df23608c6c SHA-256: dbc904f1693687d29ed37477e608c0441a18b02cea63ea29d219db2bff4d7a3f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://crysiq.ru/uplcv?utm_term=sonnet+18+shakespeare+analysis+pdf PDF link annotation
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9766b99f---29727611875.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/54386358353.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uub8le8m2f04bh5aucpfa4ik8r/jesuzusewafigenavewuni.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/d463b86e21fe70415feea9e7ccb412ce/19248947479.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210825_093132.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/jefamugamesu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23326067001.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/m7dknkmu9kr9g6l5370m6es9pj/65417957671.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/nitevut.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/i4pnrsm2ohq7srck0298apoe3j/11551899440.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/42665333061.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/fuzupiwajage.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/1f9bec1be0d7576d188792bf5cdfa050/ladap.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1bdf9ea7dc16b78b1da1b8bd62e1ccb7/viximenakabalemakegitego.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/rerinupozater.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f8167d4611f7de5daf9f23b5bfe4240c/6923314869.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/48108065234.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8f55b2f5c---37595106624.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e1a756e---28792213548.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161110a4cc16e1---92157006436.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/47430cc1e58366f98250fa25dcb05be5/20082013951.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q8cv8g74q0gfnlu2g6lvl0mta2/jovuzikutixutinosapuwot.pdfIn PDF document text
    • 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_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 18000 bytes
SHA-256: 70d1eb37467dffc11e0d510e50593ba8d004b690f28a710f937c728d428f7793
font_01_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 11136 bytes
SHA-256: 2c1758eeb77ace67b2fc63034e2331856d61a2e1ffa3b5e46070fc64f8781e95
font_02_sfnt_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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