Malicious PDF — malware analysis report

Static analysis result for SHA-256 256872917f378a72…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 10:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1355182d71c60b302ce91cdba003bc67 SHA-1: 8547814e76244f63920b2bfeef97ccd14b08751c SHA-256: 256872917f378a72433b00a5341d1977f0c1fe5cb1f3cddecf33628e63fe104f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via external resources.

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://art-eria.pl/mandarynka/pliki/files/pokemi.pdf In PDF document text
    • http://airelimpio.mx/img/editor/file/6109488794.pdfIn PDF document text
    • https://kawanmto.info/contents/files/lelegoninulegale.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/sakikotatolo.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/84518000885.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/04a71df6097e8c71c52b6f2d4dbb6480/dibomepux.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba0cf31ae---81048543674.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xuwefuworozepizojoxewo.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/vojolewajuwafimovexin.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/xatuvododekapakemi.pdfIn PDF document text
    • http://kunbot.com/upload/files/90470138294.pdfIn PDF document text
    • http://vejwun.cz/images/78398958423.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7081427a---sozuwibadabowu.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/kamokaxobexakobupoloditi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f1619f289ed7e07d3e5ed7b10d8d0881/35016869352.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365e323ea02---67800267251.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/kuxilalixozuxumikufidebod.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161468162b08ae---52013043808.pdfIn PDF document text
    • http://jinyezi.cn/upload/rolaxuva.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/22456430700.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/kanasitezebojugerojoti.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/zofezalakiwogakosuxerefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=stream+a+christmas+storyPDF 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_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 18400 bytes
SHA-256: 0e8ffeb6fbce06cba3fd7bcdae6f942530779aabc66490febf851290acb73894
font_01_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 10536 bytes
SHA-256: ae1207e8dfb8b21987237a4028f417d24c64fe1751a4358d1011dc9fb3bc9184
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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