Malicious PDF — malware analysis report

Static analysis result for SHA-256 756408bbad2e75e2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 00:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 685e40b0a0f406918834d4cce6a0b97e SHA-1: a0dc73c029cfc6883cc15ecf250ec6a4288ef9bb SHA-256: 756408bbad2e75e29bbcda9f24265119a8345a94be7c80d6785c1f97798c1e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=shoulder+exercises+arthritis+research+uk+pdf PDF link annotation
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/saxeden.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/tumatoregafirekozunak.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0b1c65e89340c991e500e809fb05a52a/melojidola.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7329e6b228abfcf91060a8aa1db93826/denixigu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/36491832464.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210820_FE48DEFF2823709E.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0hn5ibs875n905l4d8m50e39fd/24130345141.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/nulifibobub.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/009889bea89c118276599d9f2c775083/95476395904.pdfIn PDF document text
    • https://cmoretv.com/userfiles/ziginikena.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/sokakuvizokekegogar.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/61692713667.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/84145659644.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2f65b56d9---jewifukejujizefibozus.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/dixekesirerujekegazajusim.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/nuwaxiralodataf.pdfIn PDF document text
    • http://biomehl.com/images/content/files/resixezenakevesavabofeza.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/totugitesomaxunuxa.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/08b2ecb4f38f2ab56ca56e319e107403/77951667434.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3689d5094---53329858506.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6c97f5fde329d66c66394b87778307c9/kojobizuta.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e02b6a4b2---64077419239.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/sefujolisi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16572 bytes
SHA-256: f866592657c190e2b12f5143969107d99c8c4e2d796696db2730e3a23af985f3
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 10980 bytes
SHA-256: 9fa2b1aaf6459e189dd6a92a8d312f4c48b8a6ebb55dea72c60f212d30b401f2
font_02_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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