Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c0cf3274a8a5f4…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 05:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6d6c42cbd2bf882273c300d50d7045c SHA-1: 6ef4d3cc2ed675a88557c7c93a98ca4397142c85 SHA-256: c1c0cf3274a8a5f4b44fd32bb82f73b4abe71aa51e373354a754459b0407e94d
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also hosts a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading malware disguised as legitimate files. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=trapcode+particular+4+crack PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c270a810c---83077827890.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/zugeguteruwat.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161410fbc593ac---36283947388.pdfIn PDF document text
    • http://tiquital.com/documentos/file/tagejavujebenodarasuku.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa6e2c4f7---36135637232.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/xowiwojeruforelumikelas.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/16389323132.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/10733706339.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/mikusarutedekew.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16149070a91202---wugavijawikofunil.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614447bf59bed---xegidupaduponiminapomaxux.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/1302456648.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/64392155033.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16134283984ce5---zojovodisuzuzeworegujox.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16143865dc5ad7---xebor.pdfIn PDF document text
    • http://ccshecea.org/upload/files/mezureme.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/tiverakigujuxofok.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/fuvawodinit.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/70140222171.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca3d62108---60511582458.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/74808603846.pdfIn PDF document text
    • https://masihpt1.com/contents/files/85037208977.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_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 18020 bytes
SHA-256: 6c1a8dc2148158f1bf5d190184ff6daa39130c78700c41ed740b428aff2a6657
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 10468 bytes
SHA-256: 7695b50e527db5f69d91102f199f6fba3cfac3b8f71d03a6c0b3697c0648bc2e

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