Malicious PDF — malware analysis report

Static analysis result for SHA-256 228ec410a5bce7ee…

MALICIOUS

PDF

101.5 KB Created: 2021-06-29 13:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e80ff8a6a2a15c16f013971fb2d5770f SHA-1: fd5b8db3cd60b5a2e25b29d73f317a8099ad2055 SHA-256: 228ec410a5bce7ee23c81a3d7c91781237ee41286486ff6c1e8ca75aaf74d703
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to various URLs hosted on compromised websites and disposable domains, likely to facilitate the download of a secondary malicious payload. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dambi.pl/userfiles/file/13759143755.pdf In PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3c79e6c8---13993223155.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/zulozalafupi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/f8e2f02c25d1b74fbaf30864b21584f7/lalifor.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/kadakepodupe.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3013850f3d---xaxiremewugikasezemo.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/25418615253.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a93e798d0eaa6a5edaff46eadae7b6f9/65654351242.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096825380ebc---foradubudunivujilunaned.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec92e5fdc---xebisimagesofa.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a41ab89caff0e38590727b39aba55f70/84185530281.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/34516570302.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce105ee56d---37005650418.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162518294717.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/9372254711.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/fiwapebepatu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/dc72ad6cc64c4962a7e304a0591c0431/wanilajes.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e64931b8778dce567e7c8e1ef1ee24a0/rutonipobobuxabefuro.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/49868231560561d7e442128cc9411b9c/52638091523.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608e175c7685d---95216126328.pdfPDF link annotation
    • https://cgeminfos.ma/upload/file/dawasuvukudizofixexebe.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8611f08---98814842166.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/99550772084.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/49362559624.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea4d7608a---45757135080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+bard%27s+tale+remasteredPDF 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_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 10248 bytes
SHA-256: 90f5d93b8aa9be477aa63ffa22679b27aedee56de3d33b813a90768b6fa44986
font_01_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 17004 bytes
SHA-256: 1433fded29aae041a3fd2a7c201252c8006738d9b88bdf90fb1975ecd3ac5d65
font_02_sfnt_off00013e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001561f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561F 18512 bytes
SHA-256: a99db2e07c22c864e22b97a3d97429486ecb49aa2053f66f7a7c03801cfcc6a9

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