Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf99b8c5b0689e7…

MALICIOUS

PDF

98.6 KB Created: 2021-08-25 04:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7b6b2693aecf4b1c1fe1e38e9ffdf24 SHA-1: d8f9e940f8eac6c6373644ef79c18456b04ee68f SHA-256: ecf99b8c5b0689e77c5254e9d56c0e1bcb965cfa5827626240852e4edb7abb34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=cheat+game+need+for+speed+no+limit PDF link annotation
    • http://unityproductions.com/upload/files/koreveroba.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/82314036922.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/gc9fev64anr3jeellfef10r3i2/58605675825.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160926cfd7cb6e---sololanasirigepamuvo.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847db149126---88963788890.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/22a7822685eb94ad4f3df0b4eda379bd/83474578743.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/63cafea3e2d3966830caed37a2dc0a97/kikojorilomaguxutesijonip.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0b2c793ced266596bcee6e48ac32e6ba/rilegutixofodim.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/12077891422.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/81733214813.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075389c5c00b---79707429885.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6738b9dc32---26486524367.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/86589687298.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r721osko3as3e1gdpd374u90v7/44018378458.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/kaxabirodirizidumena.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435e26cb10---10097201099.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/61958657936.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983c81115aa---34727767549.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/76459962590.pdfIn PDF document text
    • https://efnnma.org/files/file/7270713846.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/tubaxulakemu.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ganogijopojupa.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/49159163402.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099b8df53ed4---74150834477.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_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 17748 bytes
SHA-256: 77b9317ff848200324551cf9dcc2882593392ac995610b5a4b77169ca8ec9b22
font_01_sfnt_off00014a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1B 10976 bytes
SHA-256: 743a4389d52ebc5a4e260f961e904a9779bc3fc7c0c48e5c8ce70d6d6d4e5653
font_02_sfnt_off00016335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.