Malicious PDF — malware analysis report

Static analysis result for SHA-256 2088e21103bc3dea…

MALICIOUS

PDF

74.9 KB Created: 2021-08-23 19:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 734cc022d060dd0bc7fe06ab4d251cb1 SHA-1: b9938671e76708ae71d284b407eef74ad7371476 SHA-256: 2088e21103bc3deaceae56f1fc44b9936ae8feb4191246805075fd1431f21859
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites utilizing form plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites. The presence of multiple compromised CMS upload links suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7613

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b25cde13e9c---67865487204.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d9b95a5eae244503f6652e0cf3cf6d09/86159655009.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5352023c6f---53765876340.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aace6ec6cc3---romifonuxorurewotuzenesa.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fd5ee526ebc0087244d798d3e0e9a220/6911605352.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/82120088b6ec0ec59ba6dc99ea30b11e/74825600076.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/woluvukikoginozuzuve.pdfIn PDF document text
    • https://petikdaun.com/contents//files/45703129476.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/19130689016.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54f094b4a---bukubovuposafupuzu.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/damakikeripotag.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/vatelerojuzopanesezumi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2650e2e1a---7994427750.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b261c77f0325d865d100f12e3b1b5f13/pusumutegafow.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/xasaboguwano.pdfIn PDF document text
    • https://zold-kommando.hu/files/6126699860.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/iqh2g8b3s4vlg1o87arot4q95f/95757728223.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/linuvex.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/xoxifumuzaxawu.pdfIn PDF document text
    • http://air-con.ru/upload/files/17491545217.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/69pr7vq9kkq56ghnhjs09kic0b/radugakidesuraduko.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082554b9c8cc---benajebabajuwoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=1000+ml+to+lPDF link annotation
    • 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_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 16588 bytes
SHA-256: 31528f1fb82946d573ee275707b2c40af8cc9d38e9c89c53e22233a7da41c6a9
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 9588 bytes
SHA-256: 545d1a3388d05fc0b42732ea4dff00343e02fb2c655cc843e2f1007cef6a131b
font_02_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1