Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb88f3e36f55c9ab…

MALICIOUS

PDF

86.1 KB Created: 2021-08-04 23:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ae1751f56eab055bf3e9cd55bc58c7e SHA-1: c865ec5b1902fa2b68a86c8075315e108218f533 SHA-256: cb88f3e36f55c9ab3e077ccb540113b45d7728cf3d413ff550b0946eeb3bd9b0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Modify Data

This PDF was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The presence of MFA and invoice lures, combined with numerous links to potentially compromised WordPress sites hosting PDF files, strongly suggests an attempt to harvest credentials or trick users into performing an action under false pretenses. No scripts were extracted, but the document structure and embedded links point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7f41d1d15---jojepatoko.pdf In PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d6f0d9026f0a23c57932944f0e17caa6/kiripowofilowolopuw.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdf3e7cfc---pezotudug.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lidamuf.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jibivunuvazamajolawe.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xetiwowudutebosavaxovo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087558ecd6a4---damoxezuzominuk.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/1511136516.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/xukozotumonusobivotiwom.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/20220025162.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/wupakaxa.pdfIn PDF document text
    • http://altinay-law.com/images/file/40442687067.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7hh5tva35obbiqbra84e00pjh0/82586368786.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/86f7ffb9a5e591414902b3e59ff51992/pinawutakeziza.pdfIn PDF document text
    • http://charivne.info/images/file/85864472195.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/5543364723.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/jozebuwikatozafeligugi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099480428105---73160764631.pdfIn PDF document text
    • http://jaika.in/images/documents/files/litugofap.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/81e22a0fbddaaa21febeb5a160878c18/legokadisatevajatatad.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/86258676924.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/e77613957a87d5eb5d2c360dc1cf0b71/gujibaxekunivakukifuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+redeem+code+for+pubg+litePDF 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_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 16964 bytes
SHA-256: ce8c37adf9f241e3732ab93507781a55fc7a911626f65a2d6d6e72da9db1d7d9
font_01_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 10848 bytes
SHA-256: f5c7a1b89362462fac86f84c0168ca3ca7823dfb151a5865eb42f4598e71da25

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