Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb115e75a19d50fe…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 06:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f7c38fbdd3ce3494d163fbf5ffadcb2 SHA-1: 7fb135cc77ecd88c6346d93a8fcbfff5e0f7845b SHA-256: eb115e75a19d50fea7e5b10e1b14a11aa137f31d06976898a600f8fc18607830
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to deliver a malicious payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=swg+to+mm+conversion+table+pdf PDF link annotation
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsihblp6jf65b8ks72v2d5o745/67618876010.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74488c08bf---kemutefemolid.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d63061c65---65062530063.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f16a8a50c---xomomepajobuxigadiru.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/82320768327.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/35092633967.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/36054207468.pdfIn PDF document text
    • http://93564497.com/userfiles/66332075390.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a975f9b7---xunolejewifefexelujad.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/77055398921.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/bffc61fbf9d64eccb0237613ce17362a/22674053929.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/78103171053.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/mulate.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1aa2fa88---96906715175.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/tovedesiruzedobebos.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/zuzevajomukam.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jeboradexenuzodisogofosem.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210611063107882906x2gi8f.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bumenefamisufiritixizu.pdfIn PDF document text
    • https://ijpdua.com/contents//files/13215253044.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2ae36142---16397927369.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_off0000bac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC4 11328 bytes
SHA-256: f26575a0fe761b4942e44d5d383ae54006ddc7b3613f1c695484f2043473282f
font_01_sfnt_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 17604 bytes
SHA-256: 1303aa4b083acea67d723c040a3001c6f5a248ad4e5082f71aea3d8b5b78bd77
font_02_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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