Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4072a6b5ba2bdf4…

MALICIOUS

PDF

65.8 KB Created: 2021-06-24 21:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f7a8f5182eb272cb2043b09bac94033b SHA-1: f88784dc72609cbb0d9c4936cd0eaf816666732f SHA-256: c4072a6b5ba2bdf4d5c00b2f7e13ea06658087286309087341f05dea8f7a4cad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=baxi+solo+15+he+installation+manual PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bfe172c75---46449345574.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/pafofanavazekukafenu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/laraxikobusosuxikali.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/89caa4a4545085bf5677a5a14d783dea/mirolipudazujel.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/22f14e1f14464edd8f183ccbcfb8a246/selowowumufip.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/57274180889.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3dcf1502e47df717c24eda1a4081135d/66568462339.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/8946120480.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c292c19127---jetukose.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/oschd4qukk4gt7p1cdvkurmcls/mutodelagofavasin.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b74fb3e1184c2e28bc71fc2739025260/51763081788.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3cc2dea6---12891468657.pdfIn PDF document text
    • https://btegypt.comfile/69095298473.pdfIn PDF document text
    • http://patroha.hu/file/zekizotosivajes.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/578355743.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5c4524a8---80305653519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48A 5124 bytes
SHA-256: 53acb90ada7df36db0216e8a0aeb7dad00b22dc86a7358c0187f564abb33d5d0
font_01_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 10740 bytes
SHA-256: 2ac6f546eec3291d603cc2c63b9c8afe6aa2c3154898d8c61db2394dbb134873

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