Malicious PDF — malware analysis report

Static analysis result for SHA-256 a102f398c55a41b9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 11:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77f90b4a0024c47d428d1a421f8a643b SHA-1: 734c77ca759ec99c10df97381e043a673e7fe376 SHA-256: a102f398c55a41b9a0a42518a74d45c3de8f27856ed01867112cdfe80e636efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The primary lure appears to be a tool for converting websites to PDF, likely a pretext for phishing or malware delivery. No scripts were extracted, but the extensive use of external links indicates a strong intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=app+to+convert+website+to+pdf PDF link annotation
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acb20d3f8f2---46521431180.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/33657490245.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9669a938dd1995e7e3e6cd57859f05c9/zideja.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/34463567917.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/24666141526.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/44610512528.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/56658045281.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7acb10b4fe---dowimewuwagusu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6815007afa16444427dff3dcde0000f5/lisaruzoro.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/miperojipi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f9ed0004ca8fc563cdf7eaecf65c411c/36078928551.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/muzasetamebipanixige.pdfIn PDF document text
    • https://dm288.rs/slicice/file/63281231643.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/33249888166.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/vezipeletamaxukowafa.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/87567468174.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f7dfd05a688806a5585758dabbd29620/jusinagepovunivusepidi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ce4d51a8b8ef9c4a8822145b1ed105cf/15709167973.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/37705798027.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/69260752311.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/168693d2e9e0905088e7bd37b0d3e8b8/xikijawapi.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fizakukebamedodezapokaxo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/f0613ff89095e03df9474bd7aa996ff9/nemipamibivazebe.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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 10676 bytes
SHA-256: 007d0805fd3e4bbe964b083e0fbeb7787075898732221574dab5963ffa8a4082
font_01_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 17656 bytes
SHA-256: 1c8ec6ae58e20a510325679f12bc1d2f5f3c3e127c4f2104d6f2aaffe91e630c
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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