Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b1e0b88a2e4e9c…

MALICIOUS

PDF

90.6 KB Created: 2021-06-30 00:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8d02eb0a767cb15e9ff095fc56ddabd5 SHA-1: 52d3598d05278c6a6f18da68d8cbfe546315e5c7 SHA-256: d1b1e0b88a2e4e9c3832c4b2de59617f290241456e3f3d7d9b0956b712761de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://notariocprietoa.com/notaria/documentos/files/50447404456.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65962ddc8---jadutowokodejizorurudin.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/58bc28b2cae57e78e99a6a5e74af00fa/63239470433.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a78cb64d61a---gogefojilimiwewemara.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/najuxagipebuse.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777851550d6---desipuforud.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2dfa52a94---kopug.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/vekifimigegapinojazupopi.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/pupovifimimoxor.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/29728206703.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/650258aa8cc766e95d0127f6dca5533b/jixovonuvofozobeji.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/14780023075.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/91714600827.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/gomeluraxuvifofapid.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/74960952035.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kl1ua1l0p0rr67umn0l14qjb4l/kenevido.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/romaseti.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wolovudufajolojafukorolu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b83cbaab35bc00c8c04265b68864f91a/92127560056.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//babijevisifogegolez.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6f95b06b261528bb2e2112b49cfb9dfa/bapoboxibupiwuzeg.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160883a7bcfdb5---luxujakijifiroxuvojofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dave+ramsey+baby+step+number+1PDF 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_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 10628 bytes
SHA-256: 62f863feae3684c57f993d04bb27c3ee85bcf92b006e49f93f473469ac1c06f5
font_01_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D78 17680 bytes
SHA-256: 2b5ce02740d7b5b1e65132e70852415c62bfe72bb9e246af36e285b7b8fc5873