Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b609330e763af96…

MALICIOUS

PDF

92.7 KB Created: 2021-06-26 14:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b041f4ba764f9785e41fa1336917f4ac SHA-1: bf1b85542976a71314a402d8fc2a0f1507ee636d SHA-256: 8b609330e763af966aa94919c976f04cdb9d9a4d2d388594d046f4b44b1a1a48
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=interview+questions+and+answers+for+java+developer PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e0d7aa2e---sobesuj.pdfIn PDF document text
    • https://aromamarketing.md/img/files/doloselolafijukarideta.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973d2b3d71e---79869333324.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/ranubasodujabinewepenitov.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/zetagipalozunufagosot.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///36830599228.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/warutiga.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8749a4e17b95c4c73e081d02cd71f061/8885055799.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094ae54d0863---13458986307.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bf03e445537520f0910fcb8a17320ebd/rebasejotunawor.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/58057025736.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/jebidisatedisimexi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/3c543037667420e14e3deb973c33ad1b/raxuvopibaxopuzuxivo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a9f09624---72698184025.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb6ae3250---47025123655.pdfIn PDF document text
    • https://alutat.com/data/file/60073011447.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b264214d0e7---mofegutavurovowa.pdfIn PDF document text
    • https://mattress-leader.com/media/44020033233.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/rinelo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609717d149904---72350663212.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/85955585101.pdfIn PDF document text
    • https://www.truemark.dev/DevelopersIn 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_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 18552 bytes
SHA-256: 282edc9c0f0526f7c301d51292181b5b2e6e5e7a03c5debe939997e3847cebc0
font_01_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCD 10972 bytes
SHA-256: 5075886f3e3b6a391492ebf2d848e5eb79733d0f6548bad3cd90e0719f626e2b

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