Malicious PDF — malware analysis report

Static analysis result for SHA-256 547da52e26715d48…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 23:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8048c42a9b252f50fcd8298f84e34aa SHA-1: a7b1286bdf3feb79f60d38636d0d38156928cdf0 SHA-256: 547da52e26715d48832c30d9d51db6426d46e95c1cd8b39fc88dee9c19599762
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf80732ef5---57854052120.pdf
    • http://adance0112.com/upfile/editor/file/32385540151.pdf
    • http://sochistandart.com/ckfinder/userfiles/files/47625119309.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc385395122---94028409167.pdf
    • http://botosani.ro/img/uploads/file/somoduzewome.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f145ac8bd---basolowejef.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa92033da---gululemesixe.pdf
    • http://russkiivopros.com/images/FCKeditor/file/10425885819.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12a8a4d8f---firasiwamalivi.pdf
    • https://cafemocion.com/userfiles/file/70098958595.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6c6e63d9884e8e00298343d46e13a8eb/nuzojogomitufidudolan.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/gevotawonusa.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8d21817ea97ab07e26efef4c9a2f8ce/wareja.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed957f3102---liguso.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/61d9627374505291c3e8943d113dd823/96491190276.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c369837f3b8---7602692915.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacf3ea188---33564625477.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d335f8693c---nanajibe.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e819e19e---kalotexuvarijixej.pdf
    • http://csc0451.com/userfiles/file/20210619132628_uhcy10.pdf
    • http://astro2sphere.com/admin/images/file/23916134801.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085b9bd7013b---47081895993.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=i+can+hypnotize+you
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
font_01_sfnt_off00010a77.bin
69f9acb712f1d27989b7c2aca856bf832207dd2ef9e92d9ce0c3f5631c822ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 17536 bytes
font_02_sfnt_off00013812.bin
90aca5ebde1611ecc3bb004f8e3586c4f5f9f773adca04d3868f4e767e8b909d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13812 10380 bytes