Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b710d83d7819e8f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 14:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf5eb0d55ef775fddbd9a42c6f37369e SHA-1: 825a0a547689ad0f27a2b2b6b0e9cb59632f8aa7 SHA-256: 9b710d83d7819e8fda5446d1e8667793ae408160f80967ec71945f497c87f4c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=download+resident+evil+4+original+android PDF link annotation
    • http://plaschke-partner.com/uploaded/file/famufenofixikub.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/kesatazo.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/58597560923.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/zedulotukabaga.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/16440394213.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd4968d60---32613689865.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/30117826120.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bh38tekiqsir0g4pupalrhjc5o/97560661644.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/ragiruboxegop.pdfIn PDF document text
    • http://hijoin.hu/editor_up/wadezuluxubepitaviramipam.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/86704136102.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/84735019603.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210905190539.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d59789e5f4ece119882efc1ea912779e/53232206423.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/bijetabudewuzut.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/53267493463.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/53eb1683bb7103d87ee7d615bfda1d5e/22947687384.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/kejazejeb.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d02132c18---vidilugipajagamanizatip.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/77568213644.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/3198756200.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nenusij.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/92237529581.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_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 10652 bytes
SHA-256: dd1ab3f97f1903609cba1e2415367313e5ec6b1f4210e7730abe4c8bc3d55513
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16856 bytes
SHA-256: a954dab636e4bd58f241b721a3dbd0b6b953dc67d8d3a5a4dd472fb52eef3163
font_02_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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