Malicious PDF — malware analysis report

Static analysis result for SHA-256 e094f95b09f1a9ea…

MALICIOUS

PDF

77.5 KB Created: 2021-08-10 18:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df251b6ef5ac8d09f3c326c47d293b3b SHA-1: cf699740ac777d6db71dac941d66e504ab5fb825 SHA-256: e094f95b09f1a9ea90da2275ee87a655c15bcc25c80b7f7142856165b6cd9fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links, including those on compromised CMS uploads, suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd337a7b9---96764642979.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b07a0b41f5a6d6916302c1cc4909963c/15634972611.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/03ea5f5c11f1a004b47ccc7576c33eeb/2340997134.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e248bb3f35---rolusanaguvif.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/160625321078.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0f9e07b403641c5ecf48e55485dba891/61893245036.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/deledisewanex.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/16277951401712303912.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5146c687---gewegelefug.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/7441149745.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/wilujobavamebijatid.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc503c4796---56085341567.pdfIn PDF document text
    • http://coffee33.ru/archive/file/zemip.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/90d4a9bafb04b8125fe44732b9e42fb0/53083506769.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608946c4e82c6---gedunudavidoxaselanamil.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/34690983627.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/bifafusejagip.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/vabometubud.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/zeropipif.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d2d2a6e55---79514597249.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vavkqabrcqicb9lue89qjahdbo/63145569731.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2561a73e---wedemufuz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bf83439dc0f---26765584353.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b020569ee---17902722906.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/45886351354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lsat+pt+82+answer+keyPDF 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_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 17020 bytes
SHA-256: 34ed44fdc3d5aab53c7fc692d75a0e53180f7f574628b4b42b535217bae98bae
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F86 10564 bytes
SHA-256: db1afbefd308d7880ae5c951625e6dafc254f44f6f231bcb8953a9fdeeb95080

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