Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb00b93ef5af4bc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 23:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f0a04c1d1f73bb329c95c35641484b3 SHA-1: aecf84254f13ceb3c57385a1cc3b904933610c13 SHA-256: 6fb00b93ef5af4bc05f15c9dd3d60cff3b48b92e8077ff009a7c1aa01213f1a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://queure.ru/uplcv?utm_term=garena+free+fire+psp PDF link annotation
    • http://techmechengineers.com/uploads/jipano.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/gurenagikaxoguriromalo.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/zutewuvobupofo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141e640a6e03---jafopotigopo.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/fetazogobonofub.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109072044573595.pdfIn PDF document text
    • http://gr-chem.com/upload/files/22203826956.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/totazigafaxuzidet.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/fipibomijabifuxabesa.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/23610690415.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/98527320773.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/firiludexisebekav.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/giborilugesif.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/zutopamibatejuvotifufo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/20302716576.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/64117249666.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/17523302788.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/vasajuzanobubijesabamono.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/mutovofuvutimapagevug.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/19196514518.pdfIn PDF document text
    • https://olterus.com/contents/files/duwepufezugeworapav.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///vinud.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb0f68aa3---16143497864.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/57189913803.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad2618922---76636256825.pdfIn PDF document text
    • https://tmtteks.com/files/22507299385.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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 10124 bytes
SHA-256: f623baf57c6d22d459a1ba869d997e9f1642bd3eec3f122781142a315d4b3f24
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 18704 bytes
SHA-256: 3d72829f40f54bcd3fa5df3f64557b5a1cd19733e965ca68d1c031522cb6f420

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