Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6df4a34fef9b0cb…

MALICIOUS

PDF

86.4 KB Created: 2021-09-06 16:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1a0fadc36d602f068452a5e960602a2 SHA-1: 665474413fae89bf8e8abd86602967573b41c405 SHA-256: f6df4a34fef9b0cbcc08b63b51412d01517835a45acde42220cea0df0c0b9682
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/75230557461.pdf In PDF document text
    • http://mid-europe-ex.com/images/blog//file/18159956128.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/8214664757.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/fivepowine.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/sixuzotupogesiredito.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4hs2udk2q8ijqg03nfmrr0mc73/38663414612.pdfIn PDF document text
    • http://belloverde.net/emailer/file/32367239192.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/83230420307.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/85404260692.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4381c75c---gubevusikobumovo.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/46725216600.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/31421714659.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/483be4bb270865411e81219da2e3cdca/napododineleku.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea30711816---87794189670.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2aef7f1c717c9e47aaf7aba3f4d13eea/miwosokofugoxa.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607f765d05e0e---tokotululupafutusisagumoz.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lob71v22hlaoer635mn0licagu/gevefovotonizozose.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/eb51d9cc10ebe712f2a07e35d2c955f3/jitubaxemukatalat.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609773700e6f0---rosotirivebebunefefad.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/wumonegipujujufigisir.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210802091125.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/wojobiditanixalomuxipawo.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/talojimajubenutowokifo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e170607da3af27c07409efec77428af2/67477624506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=algebra+1+exponential+functions+worksheetPDF 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_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 17912 bytes
SHA-256: 46d634b2b461bffe67ad23bcb00553baa40418f2ad5fd70aed62af8525e0af6b
font_01_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 11312 bytes
SHA-256: 3a2d93f23d8b4a2446463c330ba11f0c2fb811f3b33d1467ad36e85a20c4459c

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