Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d53371913b83f4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 07:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a5cabca7c444973c1c1d697e846d7f4 SHA-1: 68b58f7c76f692abfcaca1e0700de67445df03c7 SHA-256: e1d53371913b83f44f88bfd100bf05aab8bbfff7fbf9ad9161a0a94d255a3b5d
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload directories. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yourdentist.ro/app/webroot/files/userfiles/files/maled.pdf In PDF document text
    • http://health-bridge.in/upload/file/tuxikodalaxeru.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/duguwudavunuwenoxijalaje.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/61002761035.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/22596654767.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/97465439955.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/87768060290.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/92887515848.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/karisitomukakobukuwu.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/88057491169.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc938f94a---52167386807.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139051a4348f---74944107143.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/92744534290.pdfIn PDF document text
    • http://dytac.hk/userfiles/60338675536.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/90042265423.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/3854593462.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/nemefabozojawewatotufa.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/famekalozuliroladi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614012799ce40---vunisigivigoxawenok.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/dunovudasiw.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/23663499243.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613098b7e4344---netokuwazejaxop.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147f96b5ae25---muruwelesiribopidojedenuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+pokemon+super+fire+red+gbaPDF 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_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 11164 bytes
SHA-256: 4f5d2fcd173cfef4482809ffe5bb3a9698825ca1dc3ef27aa4c5a198d2f3a895
font_02_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 17048 bytes
SHA-256: 8b38eb83d76192020142c437dd648abc898008ea79297a3a6c7021bf89f53040

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