Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ee8b6499747e7…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 01:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2695268604157c4d0709af78d8accc98 SHA-1: 02246ce703b5428e1cf9010c59df8527aafaeeb8 SHA-256: 753ee8b6499747e79aa066fa10b1b74d70ce91c3ca1bd1516817486693959b6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or initiating malicious actions. Additionally, it features a link farm with multiple URLs pointing to other PDF files, some hosted on compromised WordPress sites, indicating a potential distribution mechanism for further payloads or phishing content. The ClamAV detection and ML classifier strongly support a malicious classification.

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 http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/68557194358.pdf In PDF document text
    • http://cosmikkino.ru/sadm_files/jarodokaxamalegob.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/63587004130.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/28456316022.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984360438f0---ganaxaru.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5b4570893e5ae75d0f1d6dbaa8cc0b73/jobuluneg.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/vurajejuvufiwatadeb.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/11774407782.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/41161495009.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/pesunowuzojogoranenipamug.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j7ms5ga7qregv439qsgfflant3/sipod.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/83652570964.pdfIn PDF document text
    • https://fultoys.com/userfiles/64777167286.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/69784525080.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/55297949878.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b7c5picdo7asq8vrvm0lngl9l/gapifatovaj.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/gasevuwizigefub.pdfIn PDF document text
    • http://rideco.hu/upload/file/feroxibolukusowutoge.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/56334649965.pdfIn PDF document text
    • http://banquat.com/userfiles/files/popir.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/39591229422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=electrolux+dryer+parts+manualPDF 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_off0000bca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 10884 bytes
SHA-256: 832f1469f7a3ae1e39da518901aad77de2ef70b711b8c98cdfc9fb47330d8a84
font_02_sfnt_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16584 bytes
SHA-256: e0739d7001bae47388f2bf36e26b6b155004353fdfdb041367ff3441f01ba136