Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d2cb4ea07c2934…

MALICIOUS

PDF

91.0 KB Created: 2021-08-11 07:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4fc1092e481c27641e6fe01bea56a857 SHA-1: 7b2d5d3e794624f2a153311fc7dc87519fd0a2ea SHA-256: f6d2cb4ea07c293482fb3bdd291fbc35267a0ca50233ee373adc2a9e1ab314f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised websites. The heuristics indicate a link farm designed to redirect users to malicious PDF downloads, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://philabc.ru/uplcv?utm_term=physical+and+chemical+changes+class+7+worksheet+with+answers+pdf PDF link annotation
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/1aedc43edf3b03726e93877f60ae7c80/fixedodidunimafiwejikidij.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/xedusixexi.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/32369647660d9602bbb1bf.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088535341487---78229792819.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/58737473001.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af1c6850d---mukenasoj.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/34ea4fb0fa77fbe69ac40616b0384efb/pomumevariwe.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/rawejawukobabejogilud.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/devebumuruvisoxu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608345dce7d75---gopibuzamolaxodeke.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pckbb9jjm1h19rpjsgc1pm8sh3/jijizatobepexajuvib.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/defa62400aef2acf731600220fd8c915/webanawerasipijawevi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd1d9b92cc---xelekafevi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f627a7c8b---69659556779.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qct3u8vnmi72jv7ckf27n9m99m/15920435081.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ebbq6bft1o1ttjcfm7tln7c4t1/ratezezodisilu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849a8edaa0c---33924068307.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/73191561220.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6f16a5ca---suzofilexasabarafidobig.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a466f98d05---58367854062.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/fovogokafe.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/17944059000.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/ff8b7fc86abbc466c4e8cae6466b14f8/77108258923.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/22586194070.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1e60a405---10829582396.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/puziru.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_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 11408 bytes
SHA-256: 939bda1bfe8226ac6fa744d93be5f43473e138e181f087d1402fbd3c951f7c47
font_02_sfnt_off00013125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13125 16816 bytes
SHA-256: 08df43bb8463728e6e74595b87f6f6e5ab02bac1f223b70c6e30118db00acf9f

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