Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee981950b072b58…

MALICIOUS

PDF

96.5 KB Created: 2021-08-12 04:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 332f65cdb08ad1e1a7ee866458346530 SHA-1: b5c65118dbcc79b17bcc676f402734d346c85996 SHA-256: 8ee981950b072b589c277c9d3088767ce1746ec81aad3d0c24da69f70e6e1804
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification confirm the malicious nature of the file, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e2ab75b7---73213423646.pdf In PDF document text
    • http://ebslang.net/_UploadFile/Images/file/winajurutarevizomixepob.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff74a602dd---gefabebape.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a791ed5ca---58634022435.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/fotavunib.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/16fe0c2fc87458c172ff48ca3bdff9fa/ridewofuv.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/tijedesejesexazenazab.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949db66917---kobagirotekuguxogawebimim.pdfIn PDF document text
    • http://mopron.ru/upload/files/67992747719.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/posizubabodakoxugakofawib.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/subemudozozowedilosoja.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/91770145663.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/50365643890.pdfIn PDF document text
    • https://grouptm2.com/contents//files/8970096098.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6818b9f6b74c1f486aed5e16d836d7bb/gumibipupadufimaferevefu.pdfIn PDF document text
    • http://tyextractor.com/d/files/zozevanegovakowewaxov.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/10774581999.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/19538381142.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/58881781100.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/13282805205.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/41591825959.pdfIn PDF document text
    • http://asfalon.com/__files/file/38394400903.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/zurezori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=112+nj+transit+schedule+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_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 18264 bytes
SHA-256: 9882bc74a39f0190bbdcf3ca377a4ad16d52f5744217fc68d522a51cbd4aa42b
font_01_sfnt_off00014251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A68 10900 bytes
SHA-256: cac5520e2af8933ee9e79bbba5fb4a62ce65372017167f80007139856fb69547

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