Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca729633a361ae0…

MALICIOUS

PDF

114.0 KB Created: 2021-06-30 15:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f3cd65ee1864ffffcf6516d3fdbc37ff SHA-1: e4a8602ef1586e0743d98a238e68e27c81e553d0 SHA-256: dca729633a361ae0f3e6a17f83978b6d6d92f2d04e621ce865b8e07f5c929c02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is likely used to redirect the user to external URLs. These URLs are hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://wastran.ru/uplcv?utm_term=and+the+glory+of+the+lord+pdf PDF link annotation
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05dd2a47f---kobasezuzakuvonid.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f66680a82---zezuxebitud.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/tenugidipederarowurik.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/acd35023154be1111686a4f4e8b14b1b/98549793250.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ebaf1a6d5006ff2f666a00e1bfb5b155/73169486722.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/motitodojes.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/gugilorewunopuwita.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e667b367---1663912979.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/3avsfaj310bdkn0ns9cm0qluv3/50995114500.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/66025061952.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092cede93aaa---92704681312.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/d3d0rsmam7bbhk47ejforg4e1t/95175962985.pdfIn PDF document text
    • http://jarosi.hu/files/file/21989985710.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/16678676385.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/38697ce2f0c03c16ec4368f0a2b8a250/lajiririvoruxet.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197b70726c---58476942835.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f296a5897---sebaxuvusijubelakaloto.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853174afad9---89616372443.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/vasota.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/fij9a3mjg468l8lg4rvullivt6/88023911283.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/300449429210.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wusub.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/jonabodefajivukupagemef.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd8ee0455---23774108929.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/49221073424.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/37188293316.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0001262c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1262C 28448 bytes
SHA-256: 4a0350d1d83457f958acc942398d68391cd3a7f1360262aafd21ebd14395aa62
font_01_sfnt_off00015aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACA 18516 bytes
SHA-256: 9236712d82c21dbcdfd3de659284ca2862550f0ace489b20558c4c417de4ee53
font_02_sfnt_off00018a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A274 10448 bytes
SHA-256: 261a7ccd18315d7ee83bb6b2b16cc26fa236f1a8f9ff3f40fc3d086fb57a04ea