Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22d20b2fb688c54…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 08:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5a725efdc882806e328d2071c2eef77 SHA-1: 26a9d4a7d3563bdd475c71007e45e80cce0882d4 SHA-256: d22d20b2fb688c540ee5681cf7a29627396fcf2527fc5deb5fc14d4b4ba0c7a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=places+to+stay PDF link annotation
    • https://sportcity.bg/webroot/img/content/files/40260929390.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/95648499234.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081767cdfc59---mibivixo.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e9f650231f0fbc091d5897bed831abc6/xekegu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/26231350224.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/30557162527.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/22562224938.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/gpai2au3uktkhsfbmh6hl24e78/45505692405.pdfIn PDF document text
    • http://byecook.com/ckupload/files/28609564944.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab958ae8f89---39719691385.pdfIn PDF document text
    • http://thongthien.vn/upload/files/8566734190.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a923520fc2c---46128004792.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d5187eb2---nufadilemivabonujavenumo.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/safopamikifetepibiruxova.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/82670046993.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/53340056116.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/wezefatowe.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/e602d21f9facad8f6b24ff8af63b1638/93169819009.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/32556637549.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ef9ba711---87968865222.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/fusuxeramukutizal.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/12015693854.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784eb579610---85270664651.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_off0000c064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC064 10040 bytes
SHA-256: bcd7420f40466d78fe68ecb6396d5e46dfa8937bd35bece58bff964ffff80c38
font_01_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 16352 bytes
SHA-256: 97b337eff0c52c1ad3923ae93f925fd8d559cae77bb97ed6ae138e4ec4062ed5

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