Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de08e81bf42d580…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 16:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 848cc3bfaf1a0b035aa518f3867a9d5c SHA-1: 39737eb79cdbf3a0d675b7f0acd015f47f1a06de SHA-256: 8de08e81bf42d580a9acaf5551b57be65597a00e352ab7d4f5acb359a1a4ed9d
224 Risk Score

Malware Insights

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or credential harvesting attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content likely prompts users for sensitive recovery information, aligning with a phishing attack pattern. The embedded JavaScript is likely used to facilitate this lure or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dfh-consulting.com/userfiles/file/xewugowegebopuwiru.pdf In PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/31499113524.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb80c1e227---rovep.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/zimowoberow.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/73255565458.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1b40e641ee3c830272393529bf08062f/77729650176.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a74c0f8edeaf9393a7881d923646c04/2712477331.pdfIn PDF document text
    • http://eksternest.be/images/file/ratebeboxabixaxidogijis.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/xovavavamivimikilovu.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/detoxe.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/vamusozepajuxabipefo.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429024649847375.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96325a3b46---94780807740.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/gomebunisogul.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/s4hgpl5mi621at2tqgdahvamiu/vekuganenapebogopemiwu.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/73260791390.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/93332359096.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/mapusigavamide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mass+and+count+nouns+worksheets+4th+grade+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_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 15988 bytes
SHA-256: f0bba5a64a964f3900ac9c905357949b8c99deb6af3fa432c3e52e07199a2b4e
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 11112 bytes
SHA-256: 2012b045c705c0a913ffcc2a73ac2d72388d0618bd46ac51057e0524e1a6dc31

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