Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20b1ca095c722f0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 08:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d28c8439e58bb1ad8dbfeb5579ec207b SHA-1: 3c99038a12b420f4d5738e93696c188038b5b809 SHA-256: f20b1ca095c722f0a10764db7586100e9234d578ade938abfa098168ab7727b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=what+is+the+difference+between+kumquat+and+loquat PDF link annotation
    • http://purofirstli.com/userfiles/files/worelekekemo.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pokuviwipawuladefuboluwo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdac6565d---18278881240.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/8f58fabff8f766777dac7bf25a7484d9/movarusun.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/35605387074.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/bb44acd57634b0b97ad49d3f23d3c015/7892044597.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/e55f15751af6875abdb3b482b776f2ed/jesegebituvejeve.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0ed8f0fc---29073896070.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/95e74c1d7c98e38abecc3c66e317086e/62548171872.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/dijonoraxidufevopukajav.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/buvabiveguvenarereruzanig.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/kulalebowevumiluji.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b47870f6b---tosimifi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a641c336f---zapoworo.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/sagogomerirakigebe.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/71cc7d01d1c13ee33a580e6f0419a160/gumatet.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/32402179324.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/munimebaromexitugux.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bc9117d58ef66e4425eea3bb585be724/8905424150.pdfIn PDF document text
    • https://nada70.org/userfiles/file/bakowitiwudo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161058208c4264---fijibumuwu.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/85145325908.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/8sme0s6kvj56i7vbh77cha3nfg/malagabubakali.pdfIn PDF document text
    • https://saporidelletnastore.it/file/kosovobujawenofes.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/9532886916.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c283c8c85a5---tapara.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_off0000be4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4C 15396 bytes
SHA-256: ffb3dfe1587e493322f14709359d708a846bc52f8a01eb65cf5e80f21a6adda7
font_01_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 11300 bytes
SHA-256: aee8bbf6893d63a688595ad8c3d02e0ee26ef906029cf5e7e2f9b8b8df0a738f
font_02_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1