Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c7966b3c95dd34…

MALICIOUS

PDF

94.2 KB Created: 2021-08-14 22:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc9e9b3299fe5d309f615b7a1ce843b5 SHA-1: a853b27e17181c3b914ed528519d857f7db17034 SHA-256: c6c7966b3c95dd341f3d46db57b3d5e4f0f3cfa57130591ef9f4d692b6fdedca
156 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting suggest this file is part of a larger campaign to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=speed+seduction+3.0+pdf PDF link annotation
    • http://parejalecaros.com/adjunto/upload/fck/files/werewerafijinamegi.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/ruzoti.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/48960784440.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/011261fe855ad5c93b1208c3aa26632a/pugadesij.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/liwowu.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/2182442822.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ca4a72fb6---xanojovobudi.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/98658737713.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3f54f4da4ecf77d08edd7e62799c9fef/bokijopego.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/51385832051.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/82615949501.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161125b11c4732---31984741282.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/35a682acf4edb40f8c38638ffc6d7485/43906756096.pdfIn PDF document text
    • https://ms02bet.com/contents//files/xezurejotoxotipikawipol.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/wigemipopanitoruwimolasa.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a3c7a051---paruzorodekimewojutizalu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb16d57f9---zureneriso.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/lexarozoxamanitorizuve.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1610d186412bbb---vaxadisexaxefosusavad.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/66369934359.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc431a1dd7a---36115305667.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ab1a14fd---lanuz.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3bcb0562---70549295723.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b2233bab93ee61fd9ae60e13a07db51f/79267156996.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ae37bdbe4f417ce47b0ebbedf47c0f93/89675922972.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_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 10840 bytes
SHA-256: a5872ed3eb8e310ad3609644d323fd34b3c68b1e6b3e4fe8d8b1ec69209e142a
font_01_sfnt_off000124b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 17948 bytes
SHA-256: 568dc5830000d8a98870a5dafdd6ad4fa8a09b868f842efb450a412905164bee
font_02_sfnt_off00015358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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