Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74de93b2cb41d24…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 12:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 017973684649341b9e2af05df5263c36 SHA-1: 9d7aa0eb50daf84f94ed1f1285a1d04bf11cdf87 SHA-256: a74de93b2cb41d2469fe4964f462fb37231c6d40924a721559b7764f0d9506e2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into providing a password for an archive, likely to bypass security scanning. Numerous external URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm used for redirection or hosting malicious content. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=vidmate+download+apk+old+version+2018+free+download PDF link annotation
    • http://mirai-kankyo.com/userfiles/files/vixamukegelarajepelinevi.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/ruzavusul.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c9b1bbba8df211c4dfaf3481ac8770fb/28941681663.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/woregemibuga.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/wonexu.pdfIn PDF document text
    • http://alptw.com/images/files/21578267413.pdfIn PDF document text
    • http://balone.net/_upload/file///mupaguzilajot.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141bf2937d73---72019973730.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/40966136467.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/11288877152.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/10unfv87oars8ic4sa0km7bdvl/10467456381.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/sagapujasipumejir.pdfIn PDF document text
    • http://cocoal.com/uploads/file/62001850024.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xazokukapixizuzudo.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/nokijenapipafelo.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/35323198279.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/robipirizagasoz.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132517a3d767---robil.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/4u91bnjimcpc6ls60t8bhsfrti/86899214526.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161382d707cd9f---gofodokuzigorabugu.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109121711497076.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/41312927638.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24866635516.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/botufikisuwolutoxudovo.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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 11372 bytes
SHA-256: f602f2265c011103b15a6065a59e7fbdf683dbb40ebb057a99b5dcc688b891cb
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 17908 bytes
SHA-256: a0bdee8faac72c8a2742ecfdae53031f3379875183c26c0304a9bddd40cddddf

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