Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3864eab899e64cc…

MALICIOUS

PDF

97.4 KB Created: 2021-08-14 06:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4143ef481b434f6ccd6d2a533b67c4ed SHA-1: e72c01b03695610e6f57ce519791bc9d36205a8d SHA-256: e3864eab899e64cc1cb7baa87223668284662d86a1c60242c3b3003698482cfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tecnicadovolante.com/images/file/26596143417.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/fomolesopivegowavabawa.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/afe8dc3611f2034c9969c1bb176bdf69/61941255974.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/44152145500.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed715b75f6---zapamageromezolisibaz.pdfIn PDF document text
    • http://thongthien.vn/upload/files/53738722435.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb3c29d70---1229541548.pdfIn PDF document text
    • http://elm3rad.com/file/fegemujodoxew.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/wajabigogo.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/89733883032.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/zivutoseginuvobixidikibo.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bululumunijapedetojupud.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8be6c7e180e55c813d7007348c4778dd/goxawapilenake.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae545ae99b.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/gojofubafe.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/larow.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/58228629356.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/781hv8253kcjqe04b90bmlcbdk/bememusafenelejokolove.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75d7fa804445241fcd24a7c3f9a0c96b/niwovebepiponan.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/zaxapalotelev.pdfIn PDF document text
    • https://anfauglir.com/images/file/kuliwufokimojomamurez.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5938d8fb161b88df0b804b282e418323/riwaxotarulurupizufedov.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/luluvolav.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d4285b6b5---mapefinorafobetawazux.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/98515757076.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/50665771856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=byvoeglike+naamwoorde+worksheets+grade+5PDF 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_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 20804 bytes
SHA-256: 3133d1435e52cbf57ce1c33e5f322e637bd24c7aaacb23b9d3b90d5212c093f1
font_01_sfnt_off0001452b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452B 11240 bytes
SHA-256: 996eaa6cf4dd6a0475fbfc524252c49798c04cc171256f2e35f9d4fbe389c564
font_02_sfnt_off00015f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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