Malicious PDF — malware analysis report

Static analysis result for SHA-256 271edca3bd963dd6…

MALICIOUS

PDF

74.3 KB Created: 2021-10-11 03:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ea91468da973fde55142c495a05f042a SHA-1: d5c746e6761b8a933f1a7367a5b7bbeb8d462e9a SHA-256: 271edca3bd963dd6d19d2a2e34ac28847ec3156d0dfa771e7068ffec18d2855a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The primary attack pattern involves luring users with deceptive links, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/91cf3705daf8b52f65201919d9ec9d90/44548668395.pdf In PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/geximitipon.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/lojumejivov.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/balinabuxizudod.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161610696d48aa---julad.pdfIn PDF document text
    • http://lagrupacio.cat/file/vubopowusisalipulufaj.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/807e136eb4ba0abc88088d3c9e265b00/vuzefi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/lakawugakum.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/wemimewozeberijinosa.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/47145519617.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/73896609411.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613996ad36dfd---14118739206.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/13195662931.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7e39af2f39d6b12f3b365d491f3b8bf7/96670344662.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/solavemuzejomes.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20211010064743.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/tatezexizuzevagez.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/14301045016.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0eb16ba0b---papanazates.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/kexisu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140302829952---leravobijorugebi.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/ziraju.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615592eac40c6---videzivoroxokekikez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+flash+plugin+for+chromePDF 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_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 16104 bytes
SHA-256: 26b2f0ed227ec1abf6c70d63a8b1cf92720800716744a5898988ca2e1b72c374
font_01_sfnt_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 11156 bytes
SHA-256: 07b412b8c10933581eb51a4aa5d5159cc9d6161c898bb23c689e60bfc21af011