Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b22d9eae67f8a3…

MALICIOUS

PDF

86.4 KB Created: 2021-09-23 16:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a5d59de2cd27cde1674d281f0c1e3d22 SHA-1: dc2cf3e3f21d105f57969adb5e89a2ad3a2fc432 SHA-256: b0b22d9eae67f8a3ba499c6e181349b6fa7e0921d75a2691d12aa5f8c5236374
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely 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.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc1d945o1t5rnu3bubm8o1e2jv/34003680335.pdf In PDF document text
    • http://linhkienhunganh.vn/luutru/files/39840148501.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/6500984676.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/zamuwebumatugunoparumog.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/fetilamek.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6368ca185---xofituwuzejabukeziranu.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/23511556314.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/58972852248.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/pilob.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda093e47a---mavoxeduvizo.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/83126924072.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/33283194037.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/valovo.pdfIn PDF document text
    • http://newo.ru/files/files/67741179817.pdfIn PDF document text
    • http://chinalabware.es/d/files/58627467754.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/14855648016.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/10040810665.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/bixupelirepaz.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/23583569196.pdfIn PDF document text
    • https://areicon.com/images/file/vofuzapo.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/voladonutabifomiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=solve+for+x+triangle+calculatorPDF 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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 19216 bytes
SHA-256: c50663feb34c6a6b6ca79d4e0bae99c07abb9dc214f5a934d42aa95049249ee2
font_01_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 10684 bytes
SHA-256: 67b00ae56461032e71c09b45c43b1b59c9d57c5aa07917817bca0f7d2891109d
font_02_sfnt_off000133ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1