Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd20f41ed3bab81f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-30 11:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b80ae9f09ec2673f3908dd7baa7ecf84 SHA-1: 953e6dc0ce550ea309187dc0bfbf0809c36cf019 SHA-256: dd20f41ed3bab81f15bc89c58243361b9ef2f570beabedada2567ed7a5a8cf17
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable domains, suggesting an attempt to lure users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://garglob.ru/uplcv?utm_term=how+to+save+a+voicemail+android PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ec7531b0bf270d905cdbe57909779e47/20561619169.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jabojuzazasojigiz.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/92614524324.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/66698169458.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/15078666470.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/kulagamavozidudalid.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905073430.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/sitipaniwi.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/pemugewevoravoxasawiwoge.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/zazewakafuterud.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/32141cb299307318f9a6ff38c065bec1/vizasiwilazulaxeti.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/36899444638.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/31951472917.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/57488124358.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474028f0222---78101357828.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/jurefabuluzapew.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06d2ab5c56f6de92834d0c57df9fcce5/72690609311.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/76074541142.pdfIn PDF document text
    • http://profstil.az/userfiles/file/82204287203.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e84cd491e---rapojiditujegopegedaxati.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/25379936060.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/tufexepex.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_off0000b7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D2 18264 bytes
SHA-256: a28ae4c038be3cdc2fd12e4ddeec0fb674c91dbe9d957b43ab8793182dd223ab
font_01_sfnt_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 10672 bytes
SHA-256: 2d8aa19644a618113d2240e78e38de329553f5f2b833145a1839df971e664a42
font_02_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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