Malicious PDF — malware analysis report

Static analysis result for SHA-256 0289681c65791732…

MALICIOUS

PDF

95.6 KB Created: 2021-08-20 03:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58e9f810c5c4c715c508bd715ba43a57 SHA-1: ffe83c0a255593bd349d3049d26007931c0bb802 SHA-256: 0289681c65791732900ee7ff1e3bce911f28d9e588d5470f761006c975da6a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://cructi.ru/uplcv?utm_term=cuanto+son+60+gr+en+tazas PDF link annotation
    • https://jerseyshorepirates.com/userfiles/files/65619362468.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090c04615b4e---mubakusa.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/7bsrjvqkp786tism2b1bc21ceu/fixawer.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/kapemutudedovozazurod.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8f8d7b166---buxanerodewud.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/67757963520.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/270828278364.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3d525650---99715114098.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/timowaxufew.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/55048881480.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/mimomajefekabibapigem.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luvabi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/44887860164.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3c69ba765---76408210309.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/1c7b8c9b6af8332bb92c9107217c1bb8/78026391400.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/fuvivusanujiwekaposi.pdfIn PDF document text
    • http://garderoba.sk/images/_file/85877490617.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/76940705182.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/80930902358.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/3540951807.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9813cd0bf7---81850389489.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/62581151473.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/kefazerogiwalevovinorit.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/89705159323.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/sazetewenalememavaz.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/29233812066.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
font_00_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 10624 bytes
SHA-256: 0f25c1bce56a35e5e3a8352e8599a23ede2ee2a5eb6ae24712e2c3b57ba6d645
font_02_sfnt_off000127a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A7 18728 bytes
SHA-256: 1291f64278f3322508ea1b0cc57abbffc9289d6c02d91656d9ef61d1fa33aa46
font_03_sfnt_off00015734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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