Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26ac6b8f6fdea42…

MALICIOUS

PDF

102.2 KB Created: 2021-06-29 08:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4820268a442517be204bc572953082be SHA-1: 23d59a692ea1a8a97270e43c5dfa798199d813ea SHA-256: b26ac6b8f6fdea42ba8fba3ac5077d66097bd6ed4f803f829ab501c577b67974
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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=giacometti+for+kids
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6921e780c8ecac343cecaf55adecbf0f/67207490036.pdf
    • https://pet-fashion.ro/mm/file/dilunidudelogolus.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a2534942f5939f6bf0500bd417dc902d/19824866823.pdf
    • http://technoauto.jp/js/upload/files/xowipuxiwajonaw.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b83c95190---26037966848.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b4bd87e9---385062623.pdf
    • http://files.ibiza-ferien.de/file/73055723370.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee15fe7f63---22275292082.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/72978acc8e16b19bf1f655a63da782eb/9390622376.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb88a3b4981---lofatelusak.pdf
    • https://juhaszautovill.hu/userfiles/file/nazipikiwewojumikonexizag.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/0bcd7aa3cf728e463c10a4d0a39e23bb/10471439527.pdf
    • http://goldnumber.info/userfiles/file/wulupedanilusaxaxediwe.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/2599d4974713d039963751bc37a62935/35448475014.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/btubpu3oae1kvi797fpv1l0c92/76960665990.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b7867ce1---jajos.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a554b9b6a---rivonaxoxom.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lisj602cna556benr0pvlb7r17/vefivajanikudosidogik.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9ikb28ev9j9r3acka7pe1i18nl/10499076088.pdf
    • https://pensiuneavalentina.ro/app/webroot/file/zesevipofirasoguwikitinil.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/vetivomonivuwuresog.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/91746853233b9a9f9e1363279a27753a/pogede.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ee94a9415---6645931702.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/7a7a0ae4666b41175ed7574baa2ed6d8/5865339658.pdf
    • http://a1-automotivegroup.com/upload/files/sodapimininemusokibepos.pdf
    • http://sevoir.hu/uploads/file/mopanidem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012633.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12633 16792 bytes
font_01_sfnt_off00013e45.bin
44b50781b4d9530b0e093679f24b5f83026f4c98324e47e72d986530f253dc93
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E45 19928 bytes
font_02_sfnt_off000171a0.bin
afddf7d504e26fdfa90eb4e21a9ba67d36362b37183111f17fe8ecd9d72c371e
pdf-font-stream PDF embedded font (sfnt) at offset 0x171A0 10616 bytes