Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f6b4f7ec17b447…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 16:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68c8736e980e135384c015b254d999e3 SHA-1: ad9dd027c88529725692d78547ffb1ec48dd0039 SHA-256: 58f6b4f7ec17b447bb67aa559f9aed88a82a50e4b01b93925161884429b99803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to various websites, some of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the nature of the link farm point towards an attempt to lure users to download or interact with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://solarissoft.com/img/userfiles/files/52672150154.pdf In PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/nomezivifuvumur.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109060157204894.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/67511124063.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100907124346.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9cd60ff60---27245829511.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/19bd1c471a47928e0e06513b82e7a0fe/86566913178.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/78492777201.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/jefaz.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/35382567964.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/powiguzesezawewefu.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/79280163182.pdfIn PDF document text
    • https://petala.gr/userfiles/file/dutadi.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/letekexejixatabe.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d9269493---81493584181.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/82031976964.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/loxoxizumezatepez.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/wugapalolefapasix.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375171bfb80---93132071608.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/94168704839.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/64320667758.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/zuxukubotosewegizele.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/71965259123.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1444942175613932f1d40f0.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/jubezewikuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+online+download+mobilePDF 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_off0000c451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC451 10408 bytes
SHA-256: a56db45894c62acb4fa6ec7fd273d9d8adfe4f5c2d8c384d9f03aa49cc15e228
font_01_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 16448 bytes
SHA-256: 29948247892a211ca58abfb501a3e10bc92128da945b34b361a418c305fc7ef8
font_02_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1