Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f545aea8b7d6921…

MALICIOUS

PDF

98.2 KB Created: 2021-09-01 15:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 235404b9ca4900df9da79cb462622d34 SHA-1: 91767fd32689e3a2408c0d1031fcd6b7b44d85ff SHA-256: 8f545aea8b7d6921d50acecc43e4b24b4d6cd614d44f0217c3454914483f2b10
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were found, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=cool+pictures+to+write+about PDF link annotation
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3c64f0d837edb485ac8fdbdab8e27480/70437956190.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/u8tf86kv47hpeq9vn18anffd9k/55218480467.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/49829395680.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/pofaxidakawirusoxekobedi.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/85026790841.pdfIn PDF document text
    • http://congtyvima.com/images/Download/6459834913.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/fuwamaru.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0e7ada97---nunirevikanumoluzotu.pdfIn PDF document text
    • http://carszana.com/image/upload/File/87903725792.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608372590aaf6---genebugenekaguvu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1fdbf35a---43449772667.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/rutusudugava.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/82381749151.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2582f49a3f3219e16cce96ab38cab3ec/57740201344.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/rewavetivemi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a7e7390818609400dea5b52ef2965ec4/66597410853.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jipodenimomedupobu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd85f5b2494---47315362547.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/51547996418.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/95150194882.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/68439286878.pdfIn PDF document text
    • http://arablift.net/userfiles/file/nidurumakovamilaponas.pdfIn PDF document text
    • https://beaszemin.com/files/71236208447.pdfIn PDF document text
    • 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_off000115b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC8 10620 bytes
SHA-256: cba4d3e9e7dbf4890e299a487fad2fa80c11615013b024b8b8485ccb9b6e3a0d
font_02_sfnt_off00014619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14619 19936 bytes
SHA-256: 1c671c0c1e2555f156fa28df6392d5d65c7b47502a05b4fb46d6e5e8c9922b86

Open this report in the interactive analyzer, or submit your own file for analysis.