Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ccb13d7a03056f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca3290e81872df435544e81da1203079 SHA-1: 48f21b5512ce4de350c62f81f4365fd993c635fc SHA-256: 40ccb13d7a03056f5037d711e111d20fd0db731ab4027abc3a1f90196454faaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://smidgel.ru/uplcv?utm_term=cluster+computing+in+cloud+computing PDF link annotation
    • http://fujavietnam.com/images/Download/viloteda.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/joviwijelitezutatukuparuf.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a637af05677---90717658909.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/56404548627.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bilesazirewalilevokes.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b5bf9d31f---zuvezujusibudoto.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161190715e9f36---mipedirulik.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/rjf4c1p41gf8o6jgc05to1u95f/tupojokerevitotorafi.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/83632164789.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/dijuzubef.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qecf0ml2i9a2ic4mrfklvfhhho/68744043052.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fof8201np1gp0e2g79qj2d65sv/kaninagabedotirukupo.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/15005224950.pdfIn PDF document text
    • https://sambelteri.com/contents//files/13161764924.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609077124dc93---lagajibogesurewudunadit.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/5724338389.pdfIn PDF document text
    • https://rotherelectric.com/files/notol.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160be0fe821d8d---vumepobojusupo.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/bulofoludukomum.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/viwukuvirugolin.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/vorazisigogejokilemevaka.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/301245158352.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/kogowokidamer.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dinazijamakudipuxomog.pdfIn PDF document text
    • 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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10824 bytes
SHA-256: cfc820a239fd7b714c9324189e4186aba680720f46169e5c761376f7672b09d0
font_02_sfnt_off00011358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 17404 bytes
SHA-256: f8c3af1e1af9d93915cd7785177dbb451a3d7365f686f87d1a55a5924bf76ab2

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