Malicious PDF — malware analysis report

Static analysis result for SHA-256 315558e8922dd695…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 00:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cab1500b79bc7b55dfdc844cd711fc90 SHA-1: ec60b94930049dc70326ad471b1d48e48a3b7beb SHA-256: 315558e8922dd69549c1bfc039118814ece0ebafa355f92403111ad016341587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chamdure.com/DATA/files/zobepi.pdf In PDF document text
    • http://palazzodiaz.com/userfiles/files/89017350359.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094265a1f797---gogadepor.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kolls281fe7n6pdquvlu56h6r7/59957504666.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/xosovuredi.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/47450618709.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/136556530.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/kosazebija.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160946aed35e3a---28147351309.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/16673770041.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/wepav.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vigilijekozurexug.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog//file/47427894419.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84dc78fbdc---rasolotazarunepar.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/26769168043.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/jusopizaduji.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b132709bf---60709850700.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/67726061241.pdfIn PDF document text
    • http://dztechfin.com/upload/file///xuvexig.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/bazanivemidopimopematuv.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/20760982668.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/pomofaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=instruction+manual+for+kitchenaid+coffee+makerPDF 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_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 17788 bytes
SHA-256: c3d7207256258270fa7ed5be479afa92764dacfc9de24a344b98488d0febffa1
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 10884 bytes
SHA-256: 330a60cfe1afe15930aa796d7b5e249c2d6ce31cf630d9356e473c9e99f4801c
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1