Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f87a0b1c8267081…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 18:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6fd064538a72adeb9910635a1411dee6 SHA-1: b2260ea95e5733569e1b84a2cbd7b888b00fda92 SHA-256: 9f87a0b1c8267081c77cb91102407e859e60cc8e25a8776c1b6ef84e49c8b5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous potentially compromised websites, many of which host further PDF files. The presence of external URI links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to redirect users, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://yukkumpulgroup1.com/contents/files/viwovenusepo.pdf In PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/zenepeduj.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408cbc4c8a8---kosojorotameve.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133256c9765d---kopafotakon.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1edc738ddd547449287012648bf8ac0d/wusizixawozovukomapo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bd7d026---85050792790.pdfIn PDF document text
    • http://hkalc.com/userfiles/nekisupag.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/34494027739.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/vefupivavaviposabu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b42812c0cc4d19965e3dffb2b88ac37a/71202801304.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/zisavenifodimuju.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210903_6EB86EC353DCFA01.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613500a5b4fb9---64977597687.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mijitiluvijupur.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/987309909.pdfIn PDF document text
    • http://gardatrans.com/content/Files/kamunev.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/nekosowudagaboxefub.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/xirojagegam.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/24480028107.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/15997459108.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zutikizeb.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/1600641418.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/mavugitologasimawapu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143315e22f62---wivaberaxuraguludal.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/98627205472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=qismat+movie+watch+onlinePDF 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_off0000c356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 17400 bytes
SHA-256: 2f8fe81674af5bf5b2b646f2ffea80576e609b665d4768d9698390ffc4e3cfc5
font_02_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 10608 bytes
SHA-256: b74940406d850f89b9bb3faff424d7a283ca5a036de0f4ba51cc64e49287cbaa

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