Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4487c4ac70fca6…

MALICIOUS

PDF

92.8 KB Created: 2021-07-08 02:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1973620061c42f78a782803462d8d0e3 SHA-1: 50db369f45f3b0329866cff34eeb6ca3ffe0a839 SHA-256: de4487c4ac70fca60932b3f66d295910e2b750ed146667b3eb1fff80c4a446b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/u26hsb2h7bqbfh8iot33ijlak0/pitanubefegedi.pdf In PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/40375021349.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99adea086---2854935658.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/wakogafisupewi.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/89038748946.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6fb96d9aa17353fd17ccecd3278c0c58/sipobinilu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/33603153625.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aea5ce109---73723387958.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/22734240438.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/soniloromusezunirelupa.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd00ebddef---52059243173.pdfIn PDF document text
    • http://fitviewer.biz/files/file/29712071766.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/29f115eca83afcb234b433c80171801b/wezefarodivakuxobu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ca114d57---sasolobij.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7978c691b---48076057321.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/zetuzuzakupikubosigowepe.pdfIn PDF document text
    • https://agermag.ro/mm/file/97978163605.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/72094978649.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/biqnhm2sfdgq1ea151rlujuli6/watij.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/19348011869.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/waxifomisufizofunov.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fefb989c---24268784136.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/52569918683.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c974531dd2c12e5593c5ecb259aae07/mumeza.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087776a8f121---gowesizirot.pdfIn PDF document text
    • http://apvn.info/userfiles/file/10814549426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+kinds+of+songs+are+therePDF 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_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 17032 bytes
SHA-256: bb6cb7d3fb34f7a6b13aff59794bf10e7e35078b284f3623cc8853386a4183da
font_01_sfnt_off00013420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13420 11036 bytes
SHA-256: c91eafd30c10533d163b22e3b4459ab2e2c3a8196df94d1cca3cc2f84e2105f4
font_02_sfnt_off00014d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1