Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac7ef550a1618ff…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 07:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 685897813a28c212db99dc22a396329e SHA-1: fe70dc457b1ea3aa777a0a336a49796083cdc7e4 SHA-256: 9ac7ef550a1618ffaad55dd4021ebfd4a093e7a5ba32173bbc110a8893114c04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, directing users to multiple external websites. Several of these links point to compromised WordPress upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pet.nfe.go.th/m_site/ckfinder/userfiles/files/zepuxunozokofato.pdf In PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/guzolati.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/13649439146.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/43770643768.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/binopi.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/21722620126.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/37220672476.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/58724800928.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/27053932142.pdfIn PDF document text
    • http://feg.vn/uploads/files/rotawiso.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/67056892012.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/45030425643.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/28350411958.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/67795775352.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/xatifotopanodoxomuveti.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e208c15576---jawovevafe.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/82708738.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xuluxa.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bc8934ee22d71c74b21988df88b93fef/37739446878.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146b97191add---5369555157.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/16787745324.pdfIn PDF document text
    • https://ptogel2.com/contents/files/74534016457.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/livotaraminalapubavojozul.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dekudapa.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/4944286918.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/muzexodexojijiv.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/58220038798.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/82816307357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=open+source+mp3+player+androidPDF 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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 17324 bytes
SHA-256: d8dfa1a2631c37f6b256afc8395cd570d0335a1b4a50fd256772f2b89be066f2
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 10988 bytes
SHA-256: 4755d2a491a151ae27f40d4d1834ef7d5fd19b1781c8fdbccd2763a8c81c89c5