Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3be33ef1f36a8f5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 12:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e5c568ea07db568ad806af1ac772dab SHA-1: 0845fa566c592655c62166a62ebe56ace757f04b SHA-256: b3be33ef1f36a8f55d2cf0bd4066faa349cb9de0308aa0aa822b3e9ea1fdd3d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bannermaul.com/userData/board/file/27494672508.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded431cd071---13254695074.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/63998578266.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee212774458---72964485724.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100c7d0ec141---kopezoxefajagiki.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/41651837538.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/448ce748499c145231773c46d035b7fc/92188038030.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/jovuzabakuwixeligidulegi.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/14871300987.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s7spn67rccghvqu5eaeegpt6r3/valitetaz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ea061ce18a8d82f59d4c9795af643542/nikaguligovabizafuwewox.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a6de05c16---96368228178.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/39692198314.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/59c21bef5b9adc13c2129e3b27b32514/27748925648.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce647702a7---menetetezubibugejup.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606df106a01ad---jojugabarimimekatomosiwu.pdfIn PDF document text
    • http://partnercable.hu/files/tunapip.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210623/2106230243256742567mordt0wfyln.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d6853a7fc98e4862c8ee41cab6fe664b/23923663572.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/nawazunakowaresupa.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cd877b31b8d---9863916240.pdfIn PDF document text
    • http://gibisch.org/files/files/38616673984.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/31097971466.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/xatilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=memoirs+of+geisha+pdf+free+downloadPDF 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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 16316 bytes
SHA-256: fc52c17f07bf3c81b529f54b6bf5342b65db76bb5a593d3f6faf87188a2c3089
font_01_sfnt_off0000e7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFE 10928 bytes
SHA-256: 397cf12825c649312b97835677da35e8a2c74c19d554de38630fc5cc9198b214

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