Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf15b2b41706448…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 00:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb1662d61de5f2f39ab7e3a884a6dc86 SHA-1: 77e9573dba8088e56c34092e610e53e7e842b6f9 SHA-256: 7cf15b2b4170644865faaac4005d956c6150e6274e3ab2df5c0a5bd725bb39ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the PDF and the embedded links strongly indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/aec5b3ab0b17c5dd126bdb5d6d103dea/vokimuzin.pdf In PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/67919175388.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/sodedenojopezowetujam.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/8d8b4f367818daaa2fd84b11cb34fc47/51467612195.pdfIn PDF document text
    • https://ms02bet.com/contents//files/dajiwonepeti.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd88b05166---nazemomovadaruwuzegigeda.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/424f3477c8a205fce5027a8df37b36d5/99394141243.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/c73d9segc8k7b4ipc9esgd0gk7/6010616163.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab676605b93---sebepedakop.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/70057196868.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/29125623777.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/30552335739.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16115b403daf12---zuxixizofitugadisif.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ada05a74857---kilok.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/wojinaxegomidarutak.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4660bfb1bd200151f40ce42eb5a3a555/jizamoj.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8909af46---25029052905.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210606_095004.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609c76fcee9a7---66542818758.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/sutadutome.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/964292b70e97410c9e8048771f5269b3/worirofigizinakubojom.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/pujubapudiwal.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/10457719140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=software+project+management+uptu+notes+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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 11216 bytes
SHA-256: b7d59d8e9b28a18c42174b3c48dfdd5da41fad29a5baf6db65e56f8472925443
font_01_sfnt_off0000fb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 18248 bytes
SHA-256: f85832df90eaae2d1c9abaed56394819cc5d245ca1b1905abf1c7cd43255ed01

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