Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3175d557aa15d0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 17:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64983a144425c5e06e8a8a7067674494 SHA-1: 025af1154c1f77745d247503cde3659c1e28241d SHA-256: 6b3175d557aa15d05370cd2e9cc3bd1776f37958e3e0df17cbc6d22389a8ee54
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to host malicious files, with several URLs pointing to compromised CMS upload directories. The critical 'SE_SECRET_RECOVERY_LURE' heuristic and 'SE_PASSWORD_ARCHIVE_LURE' suggest the document's purpose is to trick users into providing sensitive information or downloading password-protected archives, likely to bypass security filters. No scripts were extracted, but the overall structure and heuristics point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149f874cd225---jiwele.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfb80e96bb---lokuwelasikovowitenirigi.pdfIn PDF document text
    • http://bubb.cn/up_file/file/97071878356.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/mipudominetiwujerozug.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/wabitewaw.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/veviforosexe.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/60980996181.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/80287819543.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/83152725033.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090819431369.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/59666866759.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pedifugepamosepavonoruvi.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/cf6793164483a944de6b747d172a10bd/22328079010.pdfIn PDF document text
    • https://mauspro.net/upload/files/26429517436.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/nakamuzisukitana.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161401c9e6fbcb---88379455251.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/86529789673.pdfIn PDF document text
    • http://nensi.si/upload/file/nobijatirewukupunivabif.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b86f2d214---51928969112.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/kevewavimikotegebiweto.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/21478532458.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/porititimarifejin.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/1498372651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=smali+tutorial+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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 18644 bytes
SHA-256: 6bbc3e50d39b09e1cadfe9fbbbc834e22a691d314eaca4a5160ebf92eed69138
font_02_sfnt_off000127cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 10432 bytes
SHA-256: dff4bf3b1da3d523ad9555713bbf3dff4904bd0761d009ef257a94083d03bf72

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