Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7618cdb23cc3340…

MALICIOUS

PDF

72.7 KB Created: 2021-10-06 13:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df704593bb939305840d46882181b5a8 SHA-1: 9d674669afa4bd21d5a9755d57401ecbef6f08f7 SHA-256: e7618cdb23cc33403cf65dbdd9d3c16a63066d48155bcb574f73110780405016
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://apismorava.eu/docs/24817491335.pdf In PDF document text
    • http://abwmarlboropike.com/uploads/files/natepepetanizepo.pdfIn PDF document text
    • http://novafish.it/userfiles/files/93633224395.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mujup.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/mapazezadipelote.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/88549156128.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/38422613975.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40267726570.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/jumugag.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/wenugepuvilavazatagan.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5fthcl27mvulplrf2kqicj1h8v/22537933739.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/19908481739.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/mawawebufipebafozinixugi.pdfIn PDF document text
    • http://aven.su/userfiles/file/tonop.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/nelutatoripamexakuje.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/77183ec62f3d259f45d76713bc446cf7/68394200572.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/borelutivalisamelere.pdfIn PDF document text
    • http://sunway.me/uploads/file/210746326575.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614a29773b174---ridejo.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/93366263705.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109040503324039.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210927031526.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/gijow.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/38179676190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lv+ejection+fraction+meaningPDF 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_off0000bc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 15980 bytes
SHA-256: 4963e84b09d597e468b684b621f30a81b5d09810840a8e08ddcdc1ebf1a84e40
font_02_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 10620 bytes
SHA-256: 433f11ec1895e51196f281fca1ac58db877bf72df596f7993d9d0da4fcb1d8fa

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