Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad27793d5c3692c6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 01:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db3d4d58fde10d1ca2f445221c84fc99 SHA-1: 95a7f083e22a1859149c40720deeda2f2b444816 SHA-256: ad27793d5c3692c6d57fab0a7a91dd6673ddfedf5988b1db31859fadcf090eb5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://le-bouquet.be/userfiles/files/ximiponanapux.pdf In PDF document text
    • http://itena.si/uporabnik/file/riritarewuzefejirew.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/vafasitojunukumeweras.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/78724923775.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c569754a5a---radupapujiparududonodewen.pdfIn PDF document text
    • http://kd-council.com/upfile/files/zonajud.pdfIn PDF document text
    • http://halanmilk.com/upload/files/revigavoriwake.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca6578911---71481452262.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/1085314575.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/35006060842.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/suzufukitofoga.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/bilirabigupubo.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/8503634326.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/23541296874.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/zodimuxedujategiwurojat.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/61778680147.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/wijedabekare.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22f9c31be---92635256103.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/juwetivuwuvolitunuwulisen.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/42980582087.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/8056201927.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/logawutifilolalek.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/91105397079.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2c0104a9ec7d6af74774d59e4a6bb71d/wutalolo.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/26764111004.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/6258961386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=generador+de+sopa+de+letras+pdfPDF 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_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 17800 bytes
SHA-256: 6e4ffeaa9921f1760fcaa6fe450522e89c2dbcb986fdc09ee478730c1f86cb4b
font_01_sfnt_off0000ff12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF12 10440 bytes
SHA-256: 181da1148f2b20f655757341ec9009649759ed991074608de31ae3d714a081a3
font_02_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1