Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db403117283333d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-28 03:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b634705920e20780d0238204b70e8f6 SHA-1: 146383c18ea4468d4209d2e2ef69e96b68353194 SHA-256: 0db403117283333dc0dda8ed57a8b7da84afba4684de2bacca6b80d013caed7e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=mx+player+beta+apk+2019 PDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o72nkptltrug3oel3aenth3kdi/paxatipoxunozaputodera.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/39786302289.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130d1c1b6fa5---fopisebotepofix.pdfIn PDF document text
    • http://anm-av.de/uploads/files/95212490456.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161367d9575432---juwosedekelurefemujoxarok.pdfIn PDF document text
    • https://anjingliar.com/contents/files/gegugomedufetunutubasi.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/sudilud.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/wegisuwomesititufen.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/54168115635.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147678a6e188---wirovoxav.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/gubeju.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/sarujujuj.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fawuriwupoxolirobubose.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88928091969.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/fujizenebubexu.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/pekuloraz.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/febogodat.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/1058524585.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/luvuwi.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/25078527853.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/malononifejiwuwam.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/91981693729.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/19090886431.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_off0000b66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66D 17900 bytes
SHA-256: c06648ee38ca90ab6d06b6bfe870bb48894544f5d78a5a37f008d2005fb9075f
font_01_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10664 bytes
SHA-256: b23c07b11c742cedfd723f058bbe1638d902028988042dc6acb41c205c7c9b6a