Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d7eb5b7ffcab1…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 01:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8e878b828a5ed53ba791074c7924a5e SHA-1: 32c4dcc9038efecf64078ff8eb46a16fcb6e41d6 SHA-256: f40d7eb5b7ffcab16dd1b5af4da8889ea97b8ebf0fe10607e6f62e9e6892e99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress sites and disposable hosting, designed to redirect users to malicious content. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to external malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/t0a0qksjg3426igmc71t79gil0/27326279120.pdf In PDF document text
    • http://exmar.it/foto_fck/file/76900836715.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/27749505979.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081701ad6c7b---wizufajazonakiladituma.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/68568296633.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b245c445b3e---xosofugudimobalotosubu.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/au2a24u8ot869hb7nv3tof3q84/54442360067.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/rovewigij.pdfIn PDF document text
    • http://flomojapan.com/upload/files/guxolisowi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85bd5d364---robezoro.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/039d35d388cc97aa6c974447248a49df/netufatitovuvusixeke.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01704a806---14424511645.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/73282392942.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/c66a75c1c2a830c5123527cb836fc60a/59203675550.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf70278d5---punepomudu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/154a18e4ad27d7422dec2b051e9fb062/figonovepesopovazivonu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160969c6109f12---36534164792.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/fosunawetetover.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec905ec91e---vobirigesep.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/94803f8deb4bceb5b87c17a3e9a27029/wozikefedilunalobugale.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d40c983cf---zofomi.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/2059022948.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/rivubegivazu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adff8c688ac---mojozesijiza.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd06d2040---mobixafunelotinaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+a+good+eating+applePDF 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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 16864 bytes
SHA-256: 91d03292107a370f90d1ab79c373dccbd4436a5c98b51e897f60a45c00816528
font_01_sfnt_off00011614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11614 10564 bytes
SHA-256: 8b7e553afdca3c781239c5e41a80d240b00c24ddbe4fe3b5b8f12a83f68bfd99
font_02_sfnt_off00012deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1