Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c4661bb1318989…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 16:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7fb841b612645bb460883c8a3fa1d245 SHA-1: 33d435b50c8b8661dd6d89d391239bc8d9cb272a SHA-256: c0c4661bb13189892c0e56b52fb6c3d856db508e52376759afdeaad56e6c9874
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' and 'SE_INVOICE_LURE' heuristics. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://synerhu.ru/uplcv?utm_term=income+and+expenditure+account+template
    • https://giant-nano.com/app/webroot/userfiles/files/desonovetidozil.pdf
    • http://hevolta.com/upload/file/75715146134.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c87a84b6c---64038231156.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/logulenisexugotezigosive.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69dd843d9---lokexugapa.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/gejiwesijisebevifozasuta.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/kafepasagekafavowunafo.pdf
    • http://zsmnowakowski.pl/userfiles/file/tukexisedaranodiz.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/mivej.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607202a9bf369---4879681449.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/99dd2a1a4ae2a3dec67cca5a6dcb94d2/56917894437.pdf
    • http://xinyuemu.net/assets/202106/files/20210605134717379424.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103147948907---87978863897.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/378792f569bed1e59ba0fc480228f846/nulad.pdf
    • http://timnhanhonline.com/upload/files/80657484980.pdf
    • http://vo23.ru/upload/file/keduvofelabesarekis.pdf
    • http://asu78.ru/userfiles/file/moderulazixifazumogevuxu.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/vizelolurabedosowes.pdf
    • https://0a3exp.com/upfiles/editor/files/41117374633.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4a221be03fe62e1a0b9625d50c415d5e/tiromabulam.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/69908473567.pdf
    • https://skvacations.com/userfiles/file/vuxanonekasixovorug.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611014498af7d---96496368795.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/26453043392.pdf
    • 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_off0000e283.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
font_01_sfnt_off0000fa9a.bin
753d99b866f93848fb7516160d18cffdcac893b20095804f4b09d4a5a5ffde72
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10660 bytes
font_02_sfnt_off000112ef.bin
072c52ddc4eb877c5a0f707e57ab45a2ba3017000634dec801344181e196b518
pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 18140 bytes