Malicious PDF — malware analysis report

Static analysis result for SHA-256 43759a7a0f0795a4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 17:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31a8daec663fd819ccd9c34f995ed1c1 SHA-1: 01c7718590e2ac5b165363082b0bfb6f2e0ad2e9 SHA-256: 43759a7a0f0795a4623484686b00c62976ffc6292ed01aa1c3b10d0e1f086494
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLICKFIX' heuristic specifically points to a social engineering attack where the document guides the user to execute a command, likely to download and run a secondary payload. The presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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 http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/paladotokokujefa.pdf In PDF document text
    • http://gdgom.com/upload/file/210917170524790707wc4nvo1icgnm.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/90770360020.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/zifufe.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb91cd6c17---26256427526.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c693a2b88---falijozebokoja.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///59564222072.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e0b5f710---14415590749.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/piretuzoruzirejalu.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/wedasoxad.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/7246056043.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613221f624916---50159151587.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/31612127787.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/gemumekesigoxigopajota.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/30563468800.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/52265930117.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/96645206204.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1b2c77cc---10724091246.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/24775762147.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/mupivigoje.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/65533399905.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/34556186830.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/12296944934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+7+fastboot+driverPDF 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_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 10768 bytes
SHA-256: 3aa01a58bedd3d7011ef737a0fad254aed033775177c7886a382fa3dcaddd109
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 18364 bytes
SHA-256: 19b5492c8965f89842d0e863a366ee9c32a0a35436389797d78f6ebbd3bfb9f9

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