Malicious PDF — malware analysis report

Static analysis result for SHA-256 443f3f1fcfafab32…

MALICIOUS

PDF

87.0 KB Created: 2021-08-19 10:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e84b1c6f36801b5d33b1c535167bd993 SHA-1: f3ceb0f7ddf577a69518365ae2ab492349d24ecb SHA-256: 443f3f1fcfafab3295445b239f9f8938d99853d75bd3c9733eb10f3c48112df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, rather than delivering a direct exploit. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=coraline+y+la+puerta+secreta+pelicula+completa+en+espa%C3%B1ol+latino+hd+descargar PDF link annotation
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf963f911d5---30486305519.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/72337019016.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/58424bc28f796a55f2779e3e6a3b83c7/xirewevujudure.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/88462345306.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080d895ad029---xesewedewafigusaze.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b5bbe13a9---vawowu.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/615039908.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/60276711248.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/65592784410.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/42721434087.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ce8caf0fd4487a27770fd822e106fb8a/47575581399.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/nobiv.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/11321090709.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/1bad4d1014ccc71eb5c73968f42d1727/51814834413.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b6c259165703902200bfa48c36a72e43/mewigikoxozezamabed.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1899098e5a0e2c29b13a92425c702cc5/nukapizosuwokizoziw.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/81576325233.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3def9b8e41---sepesenogamabut.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/13817145908.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/62482894438.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/91430942133.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ed90d4eb---suxonumamawemolewi.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_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 11412 bytes
SHA-256: f90dfe35375d256a629908c1655de2d448c22bcab2b6dd7558f02d086b424aae
font_02_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 17900 bytes
SHA-256: 23b54cb23fdb31ab8c019739ea34c405cec6e2d1ebcd193070ffaf0e157d852e

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