Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a926338b90b2e76…

MALICIOUS

PDF

105.4 KB Created: 2021-07-05 03:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 00010f5d00cfd6980b36de6a1aff19ef SHA-1: 04b15ef4362576c3c4657fe5a193710e78b4905f SHA-256: 4a926338b90b2e76fb805cc37ec9112f561af81e97d10530a2cf1efa4f6e502f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of external URIs and link farm heuristics indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=green+hair+fade+out PDF link annotation
    • http://technoculture.cz/admin/upload/file/813248335.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070889c2e7af---15173855971.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6bc4e5c3de867be0e6f48feb1cb677a5/buzumirorisojepubavaxere.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0fe7193f1a24fa17b3c488fa0759e4f7/76359301354.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4a0jojuqbjb2aogtv1r7osip6/16286183577.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kisoniwebubu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608202005efc8---91099877584.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/45151390033.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609b294fadc34---dozikilosu.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/k3rok23gati6unpmrld8n94k61/debewovofalevipeleb.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c191beee2c2---pidulimazedoxutejera.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6923310b8a6a4c62fc76e71c4a4ddf37/86116001839.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2o01rq73jsongbr4srcub15juc/dowegodelume.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501081028592542.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608744a6052fe---55410817854.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tuwedadowilujekumow.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b61bcacdb---vesonevafeliwegerowu.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/47744331995.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/79286875503.pdfIn PDF document text
    • http://hotechike.com/files/files/80788837514.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e81f17ad---poguzisufilebameluto.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_off00013c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5F 10376 bytes
SHA-256: 1e4239535819afabec30182ed774aeb33a073fa8461d8a6708c687b9c5f79881
font_01_sfnt_off000153c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD4 17284 bytes
SHA-256: 5268f277a52fc99afdcc57d69ec860c66d8fa4cc9acb153145be68e331444f3e

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