Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae9c4bc38a52196…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 11:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f45d0845c342790f89837a225c5f885 SHA-1: a8b5feba3b94293eb56d236553d5d35f995d57ee SHA-256: 5ae9c4bc38a5219613d9a0983691aacb0fa6831e7c05b503c8b1e32655e5bea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. Heuristics indicate this is a link farm and a potential phishing or malware distribution vector. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://archism.ru/uplcv?utm_term=housing+grants+construction+and+regeneration+act+1996+pdf PDF link annotation
    • https://kede.org/userfiles/file/4881918724.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/21050348518.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1d3257bccebe0115a04961ca6b23c747/jejogasujovapabojedebo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16092e62acb7f6---gosizutegolutitosusa.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/l7ce8ommuergovuhrp91usods9/bejeguwotileji.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/37569601617.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32c253c6a---dofepotavogukujesovale.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jekavevizixogeponagipos.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/felubenegunozaxujuv.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/29863130191.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aac80e2241e---19021531521.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbae15ab43a---99360714369.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc57b87e71---vegefewuxupeni.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/46348859778.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/duvunenimedelokukoz.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/dalurefedomelamatagibok.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/77800550091.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161139f8e261a1---47419802570.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/67682091525.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qk7euhu871cguepnvme0cde2pq/fubibapokonezitib.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7ae91f673e640f79888b6df118bff4cd/xejigofatukule.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/287b3b92bdbe8b577d7106a13df76ff9/86569749199.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_off0000b4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 15324 bytes
SHA-256: 48331eae8d51e50b49f3377a6a501e6ef9e6321613d9589a968f327f8b89884d
font_01_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 11228 bytes
SHA-256: 08c9723150662e4b949e78414407d238ba8650844328d46dda33489aa43fa626

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