Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85c012ef7aad749…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 17:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c65615049a1af52e79974693e4f26a3e SHA-1: edd7e635acc86b9c64afb8a6717a36a49f799cff SHA-256: e85c012ef7aad749adb0c0d7a59437faab0a2088ee9e194336b2cf30e29c10cf
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=convulsiones+febriles+en+adultos+pdf PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/renijox.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777571e0090---34762272974.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/63871204395.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/mefejawurevajuf.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/zofubevate.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/gugegudif.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6bf583adc---sofubapevofaxigajule.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/dapokodeziposo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0fmpml3gd84sv9amm9r2v5l3mv/67392888417.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c285d9cc11d---44419654345.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/jixedixosalegik.pdfIn PDF document text
    • http://matras-devison.com/upload/file/24237780749.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202108230955337508.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lanewofomar.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/juvazufulirozedo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087446936f31---93546540179.pdfIn PDF document text
    • http://cloverdiamond.com/file/55239863209.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161081727707c7---luzuvelewuweliwulifuvawu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0941c7df570c71fe00efd33e9bac1fc4/61762120881.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/61329161935.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d067cdef2aa3c297e63867d4cf3a65da/wibevoguxekifujutor.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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 18696 bytes
SHA-256: ebb0c128b534b531232272acd70437db12bbd2c2afbaf8b2842018fff1e32c2a
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 10828 bytes
SHA-256: 6506a0e59feac8cc57cebb7dca65ea29c77f28c10f84538593fc063bea83b0dd

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