Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87cfb4d1c8ac732…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ae136926c99ed974208caffc1fdd4a9 SHA-1: ee63dc8a71fb3fe2817e3617d272fdf13442cb6d SHA-256: d87cfb4d1c8ac732b404dd92d0981f6a56374e4ae3bbaf7182e25635f5e86f53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to numerous compromised websites, likely intended to redirect the user to a phishing page or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=information+security+architect+jobs PDF link annotation
    • https://nhahangthanghuong.com/uploads/files/womokapibusu.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/nexofubatiwegadav.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/15fe5c7383949c59f13db455d2be0fdf/29483511586.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/19462193487.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/90943119292.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfff5381d---mamobufewolurorawog.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/11464124101.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9e6e2a6e3---kolamolivef.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/48991151219.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/168bdf96572db6e92a5c957d15721495/vinufutujufirilexorutute.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/48828970188.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/rodubalepigivado.pdfIn PDF document text
    • http://biosite.ru/images/news/file/solizegagegopapaxelexi.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/99401421707.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/zitosefo.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nasoxobawaxani.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5f02b8eed41a3f6dfca6d9226cc4aa70/9036301546.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f67a63b4a---48400101154.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa075347d9---rexulixi.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/25841793259.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/fosavedogenabofeguxafuv.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/rozufomaxopoxaxibazek.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c320b137f6---42684766335.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/3528553243.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_off0000e405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 10988 bytes
SHA-256: 8ff30d91b6d058c9d676e36ddae9daede1b9fa583f38da003636e4fd1e62ca25
font_01_sfnt_off0000fd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5B 18444 bytes
SHA-256: c8266d4dfcddc5fd7472bfaa63e7f632e3620687de24df6807be07906aec2159
font_02_sfnt_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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