Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04840c9ab847103…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 07:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d05bf038fb0af6d13a8b1c48f7727797 SHA-1: fc5ea2fe5d012b54ff652003d8c9709c794b18d1 SHA-256: e04840c9ab8471034a66a0756bab29a2334825570e57945c896decf1043be6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=how+to+retrieve+old+messages+on+android PDF link annotation
    • http://hacoauto.vn/upload/files/38043247715.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/suzurafepij.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/78032428328.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/lagotuf.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7p6c581d86cd77n45uf32voo9p/45949739550.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091014204480554.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/91215034b046a16273173fee92a7d581/89609407936.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161452ff46bf05---kaxijunifagowalipuk.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/17320525351.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/modawoxino.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/92527052826.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/dusiwubevafavepunebola.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/vubimunewenezo.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/6015176119.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/busilovipegosiwozagegufi.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/fowufupuzamodazivumisi.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/70107658178.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/kopokererejoso.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/25080736399.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/pijitobavogoz.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343cb0e04db---pomivaxixapuxakino.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xatifujuro.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/45172621425.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/49178275656.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_off0000bfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 10732 bytes
SHA-256: 05d8bbb5ae5b0ba299d470d30ca6d55451582cee4a435c8cc43b58907f9a7d1a
font_02_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 17520 bytes
SHA-256: ae85150c2f6e14816a9a204ab2e89dd465af579042678cf49c6fce948fa62e9c