Malicious PDF — malware analysis report

Static analysis result for SHA-256 d830c1ed73daba9f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 07:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecbd56163daff79c99c553277921ad39 SHA-1: 859283079667b4e6da0ffd321211e2c39e2802de SHA-256: d830c1ed73daba9fca60fe06f218c265dee478584d77154e23f6387480dffbd9
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristics suggest the document is designed to redirect users to external sites, likely for phishing or malware distribution. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc5555f336---navudogidowijeduga.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca2b14442---sewupilole.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/dawesulipejek.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/90202852381.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/23750571320.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/80505218881.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/pefijogijuniwotexatu.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/fujawutazovasezogaxozemux.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e637ffc4---gezakuvid.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-10/20210710131400456130.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/vuwusapage.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cs0aofeco18ff3muaulrvh94u0/lilafinaradajakepokun.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610fad8d49bec---subamowumefubawanuna.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1384436c8e---purunodu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5a144daab54fdd255fc90c4c3072461d/najiterijatoxapatoziw.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d2b7caae---53385176541.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/dd967a38b125ba6363cfda1d6bae99ec/bawuxokazojudofiwesazes.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962598e8c3e---gudazupujef.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210715094506.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/zevelagorunebivow.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/63521360071.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/juwowevub.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070953da9960---72968414224.pdfIn PDF document text
    • http://robedecreateur.com/img/files/zevavenuwinimodezaxep.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000b75b870---80757925373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=traffic+department+online+booking+for+learnersPDF 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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16968 bytes
SHA-256: 6ac9536a07974eda60ce2eacf5cbe813c75640808b9a030dcfcf0c589db86659
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 11160 bytes
SHA-256: 36aee77f96a0e833ba2f239eb9c1c75c5d4e918b5673db16f6a90ec2e2fa00ef

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