Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c26dd266bdde54…

MALICIOUS

PDF

97.8 KB Created: 2021-07-25 10:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d27f22f0b28e2e76ab0d4c33523c8b64 SHA-1: eb5d54512195185e3fb3f81f6a1062101c7dee3b SHA-256: c4c26dd266bdde54b1b953376d00a104f677723c6a365e5c2f31ca26a8594fcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee0e7dd79---52111261734.pdf In PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/52813065500.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607945af64be3---verinisotago.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210530071908503.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/gubidikoragi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/49991540634.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/71174815229.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/48b16fa59311db6ea15a4a71e18c7739/43838993643.pdfIn PDF document text
    • http://wenxuezj.com/images/File/wafedajojonodegemiwo.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107060545421329.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210629121052.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/fedudosofa.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/96910659382.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/40o7s5t1r8eiarsdct8blebuv6/tamodokinajisa.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/4274688285.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/71031458834.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3cb48467b1cca1d992e5eef62b1ad6cc/xoxifavatatozi.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/27357226277.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1626095309.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/fowero.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9081a4831---jemeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=castle+defense+2+mod+apk+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 22232 bytes
SHA-256: 8d92d76b4a3bce7d424f782e2f83cc160ed26a324efdf7fec942df4386726bfb
font_02_sfnt_off00012fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 10796 bytes
SHA-256: fc21b52ba5f5c06e30a2e3a1535e41c3b81278b3d91a2a490701c44fbbaa91ae
font_03_sfnt_off000148b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B8 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_04_sfnt_off00015dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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