Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e41cc3960f9a7b…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 09:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cbf63e297954c66c814472d24d9bea61 SHA-1: 8649695d00c03df92f1d86a8f45d4f5419c2abfc SHA-256: c4e41cc3960f9a7be1e0e7656591e96e625dcea75513b886e925159324cf779b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=the+resistance+of+conductor+is+directly+proportional+to PDF link annotation
    • https://asiapharma.la/files/files/jatelapunabexavomobedo.pdfIn PDF document text
    • http://stylekd.ru/files/91028439654.pdfIn PDF document text
    • http://artediapharma.com/upload/files/bawaxedukudoparupek.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/tasuwubovasiruguwemijipi.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b83cc12aed---zamexizixewej.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/fomugugixegosapuna.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/runukalovudapugefovumilij.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/26959092565.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/26625760228.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/88043978001.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c33830552f---87560612380.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/62635070103.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/85102421793.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/38718251013.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ctkmu67ma24jjlo3nf5nd2p5tn/31057934994.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/diwajonaramobal.pdfIn PDF document text
    • http://momsystem.ru/public/file/51132116805.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mndn415heggpa9q9oft8vqb2c2/fawivujoketikunama.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/lomogupevoxifowisa.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/16071874278.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/lujexulotegudavojoxose.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_off0000baf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF1 17000 bytes
SHA-256: 886eb2d8a292537f43f223d78e2079df8f26903d7d88394f77c0b99a250b5c57
font_01_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 10892 bytes
SHA-256: 60b00e0af6dae7da74629d12027091e47b48e88362611f920dcfee003acb4084
font_02_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1