Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be30d30efba9237…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 19:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfc7410c586a70871c8ff63828c0aec3 SHA-1: 90f09aae5c8c1f6495e307169a496c57edc0c4a4 SHA-256: 4be30d30efba92370055fbe0b4fdcce3e165a636a26d5f82a14aadea4bb6c7e1
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a payment redirection lure. It contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting an attempt to funnel users to phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a strategy to leverage search engine optimization and compromised infrastructure for distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pistant.ru/uplcv?utm_term=how+to+remove+payment+method+from+android PDF link annotation
    • https://abhimaninteriors.com/ckfinder/userfiles/files/gorikototekozagewojewez.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/majezonizutoxedaturewada.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/74848594300.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xemizanededemal.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/868474a54ffc9cc2924ca961e84b90f6/81951809586.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/42b88b4b810d6a702d366d70cabccf69/gisabuzirivugolisete.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/kojesigi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141727e6d8d3---zeburakosuzebusi.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/39849690299.pdfIn PDF document text
    • http://thecuriosityshot.com/40870685467.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/83882673337.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/mewatabili.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/65475090107.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc8a2042f---pitazun.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/sudigax.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/64441129185.pdfIn PDF document text
    • https://wecareprogram.org/images/file/30372572089.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/37373832968.pdfIn PDF document text
    • 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_off0000cd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD65 19008 bytes
SHA-256: b7ec18145f9c413de22279cef2b93ee7692ce568e5952ae1a7bf416802d0d53f
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 10808 bytes
SHA-256: ee38ae1d2dd73ca6c607efacbb9346a89ff76895a837e2e48bbfa2ec57117ecb
font_02_sfnt_off00011722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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