Malicious PDF — malware analysis report

Static analysis result for SHA-256 6019833a5aba70fc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 13:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce1a2e70ddc0e6707577c370ab1a7b83 SHA-1: a4c0b72aeb118feecd053489d49d683170290b93 SHA-256: 6019833a5aba70fc61b7b2f28350a3e3990e3d07a6ec1154b871e1c5491b3be8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into downloading a password-protected archive, likely to evade initial security scans. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd77f9f5f1---99333695339.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f965322629---bilozufufalutefu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f10bcb433ab69875ce7deace6a84022b/13664798834.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/vuxezetujaweweraz.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/123e0643a9eada37e5dfdfc69e1139e4/miwulugifigokurixiwik.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609393484aa45---22227332332.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/68837047609.pdfIn PDF document text
    • http://mosjob.ru/images/file/32080662455.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/90899680271.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/90400593680.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/furomuwetuduvimojisodel.pdfIn PDF document text
    • http://gibisch.org/files/files/pavak.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/kovital.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae78af6c748---gabibawimokoko.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/sobunuzagujugekedapajopij.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210617203029_afbpdf.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/waripebawawexez.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/pabaf.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mejanol.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5vtik3rjj29tseob8c8uihikq7/fejunesejoxurawu.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2b3ffcc3472d75dc2ba821b426d4e968/19700678012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=visual+basic+code+for+calculator+pdfPDF 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 10716 bytes
SHA-256: c4ff76c8b2e9bd64c9f924cb2bf49df15235cd3396c8824ace32be9f9793ee7d
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 18280 bytes
SHA-256: 4c32273e236a0a9410e403a2d77e964b44e94439f92a7b34af6869e9e2a45117

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