Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1be42ca01ac1df1…

MALICIOUS

PDF

84.0 KB Created: 2021-07-14 02:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 242832b71cf1fa71253a1b93cd99010d SHA-1: 73c3618065381294a060af4f1d1e56db660f9d2c SHA-256: f1be42ca01ac1df164f6895d47ad758f3195a7d6708ece4e5ddcdff9a1585f7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites, suggesting it is used as a lure to redirect users to malicious content or phishing pages. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=introduction+to+hplc+pdf PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2915ba5d6e83417d75f6128a2b47982c/70461276011.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/bafogon.pdfIn PDF document text
    • http://wohingltd.com/userfiles/35754444341.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/80555959284.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/vewaguborasajarem.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9834b476fe---wadusugix.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1k8akok3ngbc88l0uus3pqcj5p/wixopisixovoneke.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/41161928483.pdfIn PDF document text
    • https://akvaguru.hu/user/file/4812632178.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/smi9rbd9uuaj2p0diqt79sdfu8/zepixopagem.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/96933368518.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/favisinitegidu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/xizitiwuxajitagumolud.pdfIn PDF document text
    • http://clarasonic.com/upload/file/11669077228.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/id0eog5nv3opiu84st1pt8tvj6/1799316860.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/ruroxakesatipevo.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/75784563314.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kobigigabezepukoxevuji.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/71f6acb51b607b675bc441d5a96f636f/zojuwunitowe.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a76d1167d0c---30844472272.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/zepolivideki.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/xolowijojipotekutotot.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/vetapunokas.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/zebedokubugoxib.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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 10304 bytes
SHA-256: 15771cbeefa20dab7846d4771db98c404072777b6e55ef579610feee94cccc93
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 17456 bytes
SHA-256: 353b8d3e06c619e60569fb34a024ed9906b84a2b26227765548112f3f48c7142
font_02_sfnt_off00012922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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