Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9d9b19040286c6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 17:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d3effffcc85b99ac2680900dcc61f209 SHA-1: 4785b6008e0b503e7b58b28d9ea90b75fec31b5c SHA-256: cc9d9b19040286c6ec8533e12c4fdc57b926d1d61b4f494cb7a9d66510cccad2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the document is part of a link farm hosted on compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://goldmenu.com/userfiles/file/dijenotesifabamasaxakov.pdf In PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c90486f3b1501047283f2a807672814c/58442525293.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/21385390018.pdfIn PDF document text
    • http://contelex.it/userfiles/files/17235967112.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a6e426706---8497065392.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc4a1515f---81492825376.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/dubejixod.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/kafube.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/985cd3d9b3d8408e2198eb6f774fb2e9/84170699949.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/55085069365.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/mazugifimupifekifixisawoz.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/97626634409.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8464ebed---lejekikelukuf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/32af15543492318e2e0bf7475e699dfc/32670745058.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/32513483859.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d4b48fdca985fe4f6b128383a26f3ed0/40266907529.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/mepes.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/92596652537.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/67882193531.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/pokububupazetika.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/wutuboxesavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=probability+worksheet+ks4+tesPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/55290cced7f2459b9ec844837083d6e7/xilij.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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 17020 bytes
SHA-256: c3f114b9b9f8ebd99e97c3b3f8cda1a3c6fa5eb0d4d317fa64cece02e733ef02
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEF 10612 bytes
SHA-256: 8437f9de0904d642161b7ebc6907e93e03c53095f9965dff8878ddb89df4f014

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