Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1958ec4eec7aeb7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 22:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 432b6ac61a01403eb59926d7b6afd497 SHA-1: c122b8df77417edea5141a16874652799e5f1c08 SHA-256: e1958ec4eec7aeb7f653fecc400d6558e09d7be6cb7931421dbebfae93a0f460
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to distribute content, likely malicious. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, suggesting the links lead to phishing pages or malware downloads.

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://pixomot.ru/uplcv?utm_term=unseen+passage+for+class+4+with+answers+pdf PDF link annotation
    • http://kaowei.tw/image/files/20210527_220310.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/bidevaloro.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/64389917007.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/53097364560.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d70055139f---dafegugadi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d22622600---16791207867.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160735b0ae0223---fomaliremobak.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/93210823879.pdfIn PDF document text
    • http://www.empresshasnoclothes.com/siteuploads/editorimg/file/sobolenoladaxev.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/vbp8n0eup59ohdakkp64i8hlu5/pejagizek.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/58046128607.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/jenelekemaderejir.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/darosutudoveg.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4ffa5892---weromawubizosugifonapijo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc18554765---68753291270.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1629018250.pdfIn PDF document text
    • https://jotelek.hu/files/file/80843193726.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/62677361357.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/66340110575.pdfIn PDF document text
    • http://xtra360.net/campannas/file/bekidafaketosoxoxuve.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/nafojisibuvumigagix.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0itgadiflmugtu4s1f15pkr912/93724432356.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/83463646096.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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 11072 bytes
SHA-256: d1c0bdc6026529be6c9fce059489c06b3285204621fceedc1061df70c21be5ee
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 17804 bytes
SHA-256: 6bfc2d352d01bd69e95fd1553209d5d00ad3d0dc04704827781702b7e9b3de65
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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