Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe1c2b784491b98…

MALICIOUS

PDF

123.1 KB Created: 2021-07-21 12:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 396a894a798440433f1a63e4b1872c26 SHA-1: 214941258e7ea3db6ab14a916e91af5af5fc367e SHA-256: cfe1c2b784491b98033ad67ddc3318978891ec6b218cb79b5ea3c1a3283be468
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially compromised hosting suggests an attempt to leverage these sites for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078653edb853---62191279831.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/so76ks38qbhjiek8a3b5ubmo71/mizowenima.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/basejazexowolizidifamuf.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2a4fa0c1e7ddd4c42aff85325a0353bf/vinim.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edad43d1945---wikebubu.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/62726368624.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7627bd18f1921e0f4b3adffb4fb3e41a/1424895396.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/seput.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/e288ae88fecff93d854832fe334b9f1d/robodejanafefatub.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2915d2a036---72958148897.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/sorinobes.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/ratoxetilubomugatego.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7475450e9c---pefip.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/569f569b5c4486dc7010f339c497874c/85991068102.pdfIn PDF document text
    • https://defi128.com/userfiles/files/66597340601.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/73319280658.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/46081f2de2172b1e8096aba742e90ed3/zupokutu.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/41404850019.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/b4e31697f5d17e3c0c4900393f6d4b52/24826844225.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c3a4f7268bcd128884988c95bc82170d/34271763834.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b0275e412744f91be20f3dcb2bb37f37/18686661191.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/62984491949.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c9812693---24677739942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=leibnitz+theorem+for+differentiation+of+an+integralPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001606f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606F 16248 bytes
SHA-256: eec42f0bba4018f6ae412dee0b30f2e8f62d2964327a9edc906b3dc49daea092
font_01_sfnt_off0001765b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765B 10792 bytes
SHA-256: 074a408db5aec5faca815c53f641e2a884925d93064928cd179a237327fa3308
font_02_sfnt_off00018ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D7 20488 bytes
SHA-256: a3e14702dd323a9ab418590b3900a1a35b828cea02b51da0fe0169bb8b55c889

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