Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd7d6561244ad36…

MALICIOUS

PDF

105.2 KB Created: 2021-07-24 02:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dd1f72febb2607568fee40c08e5d6987 SHA-1: d2e2469b9d0282e9bd360ad8180f4bafac59ecf4 SHA-256: 4cd7d6561244ad36c976af868817325e02e4bb033bb2066119d94603000bba89
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads or disposable domains. The embedded URLs are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6791fb0bef---jatagupelufokuzuno.pdf In PDF document text
    • http://masan315.net/board/imagefile/file/tonufixuzi.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/37047803677.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd1e8c584---bokolozutatuviduga.pdfIn PDF document text
    • http://malifer.hu/upload/file/85082463183.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af2e85ce9---96920173815.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/dakobariwol.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/xabebog.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbe23799ae---getexigu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ua089rlucm36e4i9jv19h9q820/repeminawonuj.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/75635444624.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/gunexufovusamate.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5c7ad225d3993d52a0dc4dbeaacbe64e/52566226359.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f618920ad---56528177001.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/31044253647.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/48593197588.pdfIn PDF document text
    • http://gdaniec.com/upload/files/vudamozafa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f29adf0a---pixuxuzefaxe.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/011029071426.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/s67o8rsvoh2prr5a23cl3t0qq2/72585785674.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c53d55d962ae6c66f22a166a7e4018da/givatukapebovodisuxel.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/67960646644.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/jimijibifogimelevudi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b36d4fa320e59ee0684ef7c69550ae5e/guxukizizewefev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wear+en+pasado+simple+oraciones+afirmativas+negativas+interrogativasPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 19256 bytes
SHA-256: 1921fe4ba3d933aac3bb5b98a146b2c8913508a2556b5be0065cdca961440fed
font_01_sfnt_off00014e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E23 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00016359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16359 11020 bytes
SHA-256: 0e8e33302bc2845aad21d8c2cbdfa4a9ddd568d1003a44037bcec4e984ab9699
font_03_sfnt_off00017cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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