Malicious PDF — malware analysis report

Static analysis result for SHA-256 42491532de715396…

MALICIOUS

PDF

83.0 KB Created: 2021-10-11 12:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 523a5a5f60a1c161edec1c582729cd33 SHA-1: c971ee7975c48cf6c766bc972cb942a5699fae00 SHA-256: 42491532de715396b70511a6057aff3c2096f77b7551fb581d3e8c98a2bda1aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://theipbuzz.com/images/file/2406272311.pdf In PDF document text
    • http://neodentpetrosino.it/userfiles/files/lizokuta.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d9192a9fd---mowevoxonorebev.pdfIn PDF document text
    • https://music-group-store.com/upload/files/88216216525.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/79326269882.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/11159498403.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/20997277139.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/78593405508.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1616375cdc7b70---3774899385.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f271c70709---21965036536.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/38356587688.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161535dd0f417f---zawodatunaruxewipabote.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/gutoguduzupapupawet.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/tulamemonivosikituxob.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/jigixobajusux.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/75484884015.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/bovolunaxibiw.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/bipezokinis.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/poribatuferezefufuwoli.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zajazejejuzonegekuret.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/24022241920.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/46672516555.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161302e5f0b4ef---vazufoxewuvob.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409f1a56711---kupapef.pdfIn PDF document text
    • https://riwg.in/userfiles/file/31997737154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=new+quest+in+destiny+2PDF 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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 10356 bytes
SHA-256: c7a451b237fe1928c3cc94bdacf2b082b6c93131cf12508dbb49d6323ae7512e
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 18000 bytes
SHA-256: 2b84890e4951a5d64de96fc27e5d8c2b3bcd347d4f3613fd9d449463d65d7bc7
font_02_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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