Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24f8020e7b7e0eb…

MALICIOUS

PDF

100.2 KB Created: 2021-06-13 23:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d38f5dcd5f7fb04c35b551a7f3e2235f SHA-1: 772a04d4c7ca4fff6d804f2dc31de2b3676859b3 SHA-256: b24f8020e7b7e0eb095771c05694de6da7f23ab73142d04f8d83cba926f4e4e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=ladybug+season+3+part+2 PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4a54e35203327951db76a5d287a1476f/rurilavulawotegarajumado.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v2pu0lok5fuoppohgpa7asntjt/94944934955.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acc246ea825---25174542852.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/35553987011.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8bf00066---51031695645.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/mixazabivezovololulazud.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071a775e9357---27696172613.pdfIn PDF document text
    • http://mebco.ru/images/file/19520058988.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/de7661441e9a7c5d2e8ad1130241e4ad/wexebibalodelu.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/kewofajid.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/720eca0ff8bc2e9cd0a680482bdbf71d/7687273787.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/73191356902.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/b46c1e844c3622631c5ddfea9317084d/faloma.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/47066902111.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8e369c7681bda2c1b5c7933fbc1fa58d/61594947670.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AB 3288 bytes
SHA-256: 89212e3ee011e2623b6bcae505bad8ec3061312f852b8824d6cc2f8eaa69f65d
font_01_sfnt_off0001456f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456F 5576 bytes
SHA-256: 60fdd68120b30b0a2fa22b6a7fdfcaccf7a1c149565ffeb92c0f5d43c661807b
font_02_sfnt_off0001587a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587A 13196 bytes
SHA-256: 957b625d9f71e591cd1e5cfefeaa9898597235169e622863a08ade041f62ce43