Malicious PDF — malware analysis report

Static analysis result for SHA-256 21642d2ea4d4683c…

MALICIOUS

PDF

76.2 KB Created: 2021-07-23 04:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6e8bd4542b0eb84a85a9833a53d3682 SHA-1: 05159897759b2269123d10d737866fceec2011e3 SHA-256: 21642d2ea4d4683c9b83daca78d06ab8afaa8095649702352088131691eb4a21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded content indicate it's designed to redirect users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a163e6a6087---tozisevijagifarus.pdf In PDF document text
    • http://lyzebrno.cz/userfiles/file/defif.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee10c1110---48380247090.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/736c3a3b9489844e7ac884976d885d91/40620211403.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094407b17dcd---sedorubakofefopuda.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3574028ed---vesusobovidowu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/90216f7d5c59389e00cac58f0b256f13/17788635288.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/81729523126.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zowero.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/94493836115.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2fdedbcb4---63869478607.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290442099847.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/lefuwofugovo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e400c35e60---19033329701.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/83615090725.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96bfb9e2d---pizafemowelav.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f93d29c7---gogijotojijapajakoduwigum.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hbmosnuib8op9373ncdk2vi41i/98393089008.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/tesatejotabis.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106041712455738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+pronounce+exhaustedPDF 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_off0000c5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 16844 bytes
SHA-256: 4774ffc23b00b882a6b3b00d596f96aacac0ed53108fcda292f53c671ec21e1b
font_02_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10752 bytes
SHA-256: 9695760a393070adf4ee22e244c932b31378862ebc4be666f16f0504cc94df5e

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