Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3accb7e6d0fb95…

MALICIOUS

PDF

76.2 KB Created: 2021-10-02 21:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0f72537e809a93ee57d3bce548f800a2 SHA-1: b2fcaad1ab64dff784bfb61b718273898baf6d3e SHA-256: ec3accb7e6d0fb95dd5f392ba033e57f95cab67bc059cc2ca84e4a83f85d26c1
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and is identified as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hiroshima-teishaku.com/userfiles/file/vimerewoxij.pdf In PDF document text
    • http://suchanekstomatolog.pl/files/file/84057311478.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/41d39fdfcd73232f0dd69bdea32490f1/rafozemo.pdfIn PDF document text
    • http://proart.by/media/file/38180013620.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/noxelavarokab.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/51134368846.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/gejixixamenavorakinaseb.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/71346367731.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/mipiborufevo.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/duvubovalukowolif.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/sokorawabavozonev.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/dugowobuzokakas.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/6758580207.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/18567910274.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/63635521740.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/nakimikomebolibizalapogi.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/74220918641.pdfIn PDF document text
    • http://hotstamping.pl/files/file/mowime.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0klphfq1vd6a07dcnf2i01r6qj/3245390791.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/sobojopufu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0b5632962b7e48723839ccda4431870e/pawolakalurubuzela.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/48804991682.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/5932650009.pdfIn PDF document text
    • https://cubic.is/userfiles/file/5206672642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chemistry+class+12+handwritten+notes+pdfPDF 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_off0000bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 11288 bytes
SHA-256: 658f8933eabac14a2c351b46562af3239403fd241f7ced882d279fe12407289f
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 19724 bytes
SHA-256: 89d5f07eeafe3e1353360f34b228d535db0d77fa794d5fcecd7d51e3a6a17162