Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8f58abebb740b0…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 22:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dd8f0f452da2bed9f97773c4ac2b9f9 SHA-1: 049014bc0ed490a01103fc51be923700351aa1f6 SHA-256: de8f58abebb740b0fb7d056663e39b8e4dc435f6afe2ed31895394a93644ab8e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into approving MFA requests or entering one-time codes, a common tactic for credential harvesting. Several URLs point to compromised WordPress sites and disposable hosting, suggesting a link farm used to distribute the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://rewaqousha.net/userfiles/files/lapisizimebemoku.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/wagolej.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/93300724750.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/32901946342.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416cbf7f384---mivinetukimujupazajew.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/nugap.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/julosukufefaliv.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/39031729842.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/kagapojuwavavu.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0272127b---piguxutewoduwotiwurarodo.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/76309743338.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8975a53e---62983144773.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/51527747011.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/losofoxolupex.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dibojavoj.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/juxaparomuwotu.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/40031987365.pdfIn PDF document text
    • https://digireg.at/upload/biwedi.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/viwufawosib.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///43017447287.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/657351783.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/65718291082.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/51697442818.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/fupumezitofako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+delete+fortnite+data+on+ps4PDF 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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 10644 bytes
SHA-256: 7433473a1b9fb5b5c666b9449fa8e40e85cee3bf9ab27de0f2b24d396798845d
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 17836 bytes
SHA-256: 18eafa78e9d31d5e9dd8debc61b4570cbff1d5b9c6fb7472627866bfcd1f3fbd

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