Malicious PDF — malware analysis report

Static analysis result for SHA-256 b301d55e95808b51…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 07:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8971e114ae76ee2761ef6ec9f623e6fd SHA-1: 791e8cf710d002b3cd06ad09310e0c9432fc5e5b SHA-256: b301d55e95808b51ee4d58d6f1abc28363565b9836b99ac9df7d424e532270f0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of these links and the overall structure strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=types+of+muscle+contractures PDF link annotation
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/89952547120.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d6d47817---86951244782.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9bbdc1ff4---saxotipujezorajizajeki.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/40267629063.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/93762539842.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a96403c28653aa322b56a62f87322abe/26644072500.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sanidolizulipe.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/wemeb.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/danifixunopo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2ae405351a4210a75f919472c6f965de/94646000269.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ni06c1p7aqi50r8jdd068t6loc/977341331.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/72409399221.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097d67ddd4d4---rotokizojige.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85b611484---vokudiwepekofizobi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gefufojodozena.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210627_4857D6585A6EB973.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dba1421a6---69004136361.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e1e97d21265d49046814cd0b783e07ce/22715379540.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/darekagixemujilalobupane.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/kobibafodabekapifaviniw.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab676bc198---22733757740.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b064f06f6---retinawapazezuge.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa33a3dc897---zasiwuwufajiwolikejosow.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_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 10724 bytes
SHA-256: 5ffdd0a4fb17fa21d7b3abd22746538073d061e2ff2d281f2faeab34b3b622f0
font_01_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16736 bytes
SHA-256: 69f2cfc3f929df074aaf13d4f5da5f353a77392df7ac9e1a0753a89116411af2
font_02_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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