Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40e84af0aaf3c54…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 22:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8ed33b4deff06b145a64e91831a10203 SHA-1: 34af1278c618261fb0487820044a4992707f0324 SHA-256: b40e84af0aaf3c5488d9c2e93fe56d30a4a61be5e0cf710b25f1abf4c777fcb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous external URLs hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall detection profile indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://yodobashi-church.com/kedusitisatinixajapera.pdf In PDF document text
    • https://beaszemin.com/files/malabozutikagiradatopa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9c4b3ba5---48676298324.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/52571580143.pdfIn PDF document text
    • http://ledins.lv/cms/file/sudam.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/48870559528.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/57319407465.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/23314286228.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/gisezujosewi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1944f64085---galaloxifoge.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210820024433.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/zefaguvejuvugipigimog.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vuzokikebigawedel.pdfIn PDF document text
    • http://primaneighbors.com/userimages/62290889157.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/46853950773.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210731220453.pdfIn PDF document text
    • https://windsbs.biz/files/file/dikikevobonibuwesofo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/01c2d81b56a085c0af7673e121e47f13/46550538308.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/29596939387.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12f78b338---36035374118.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/sived.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05a47217f---kusuwivegobegi.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/43576304220.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29f3460e4---foxozogemopatoporizufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=empathy+definition+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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 18288 bytes
SHA-256: cc2ab63d77c3854af7cf4e63e37ad9fd4d657302407aafdb07835da4406497a6
font_01_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10544 bytes
SHA-256: 35d881279df163948ec25a2b1e671da5b5da206bdba6e22a08a982da9dd09c2e
font_02_sfnt_off00012588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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