Malicious PDF — malware analysis report

Static analysis result for SHA-256 73af0a3b286b5e20…

MALICIOUS

PDF

86.4 KB Created: 2021-08-11 13:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f63cdfbf592ad361dbbf1e67f020027 SHA-1: 28aac2fb1ab2ec2e0839e452f3250fdde6366915 SHA-256: 73af0a3b286b5e20239cf58b82647ffca8c494ee7a819fb7f50f79bb4c2e04f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catwalkdogcome.com/editor_upload_image/file/49919906523.pdf In PDF document text
    • http://mirutte.com/newsfiles/files/kawajim.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/dilokazeranozikap.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/44828331056.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/46388869006.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c54237bc8---bavolumebibojem.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/fiferenozigumavamizox.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/247d48b53afa598cd54b8d5e0df29f3e/8303692624.pdfIn PDF document text
    • http://splogservice.ru/content/file/kapibatixinu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03eae307a4---36181848388.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/83629510593.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/21109392690.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761f6c2afa9---nabogi.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/wegogurovuwonezofo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/69c7877f4b382cea460f4e0dcdfecb8c/moxezu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/zubel.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/seboroluluxikibadolasobo.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7e4babd5812c30d4e159b88958f931ed/23522455035.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/48367630174.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/fonetuponupakozavawij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2018+audi+a3+owners+manual+pdfPDF link annotation
    • 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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 11324 bytes
SHA-256: 82f0410a836be568b79cc3d71aada54f54d78ef7bb81276262a744bfffdf3c4e
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 17760 bytes
SHA-256: 2a300cb34d5ba5d6abf454d1a1510fae75634589268aa13f04e551b91eb28fc0