Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d34d9c5ea1e4cf…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 17:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4679c978d995801ac74e57babf836353 SHA-1: 263b3bf9f229c0ef18fe59998eccca1adbffa6ff SHA-256: 40d34d9c5ea1e4cfe3adf5fd4fa18737900c37d42d1522b9bea5c8e69e1c58f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7b43c7c147fc2bfbf42d0bd6f625c224/82913074569.pdf In PDF document text
    • https://defaico.com/d/files/77476669543.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/rk84cbrck7p2svtbj05n1vsi56/11474069113.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vdc6g938123g3g84mi9nmg606d/25108829654.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/38435620442.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/drk24pm2ga8qdefp34apbdh305/5222789257.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/21795191576.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/52066563691.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093b66c0bd59---gixirubupivudubaneze.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tujujemazupujoxa.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4277353a2---71017924031.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607802ef9a992---46386072143.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/91077513570.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/savutaninopifapisale.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/waxifomisufizofunov.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/16314927525.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xovebodasetubatuvopenes.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608156d5304b7---43171686467.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lufozo.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/23706024170.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/bdbbcef75f7eca61c45b5818dc30e178/6764263595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=marketing+and+sales+business+plan+examplePDF 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_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 11040 bytes
SHA-256: 64bbecdaaafcc7dd4d11713de155d1e30a1db53f0b09a07e985a0501673f4a41
font_01_sfnt_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 16676 bytes
SHA-256: dde51917f27db98f4b1e0dcf404c5c90601167960d01f4f61f9ed98b68fcaff6
font_02_sfnt_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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