Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57b105e47f6a470…

MALICIOUS

PDF

91.8 KB Created: 2021-09-03 08:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbdf7337ea4abd0e42105d8f5d73494c SHA-1: 8b78b40a05340c02b29614dca0ed9baa90761dc1 SHA-256: b57b105e47f6a47038c8d6f92ac63d15806ca56c187aed5b40b663fda2bdf16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by numerous external URIs and link farm heuristics pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://cructi.ru/uplcv?utm_term=agricultural+development+models+pdf PDF link annotation
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e611fe8e879---nukuponetavo.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/17151178574.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2b254120---17530740260.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/garagifenibegexepus.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/xuwifera.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/b0c4a5b78eda06a29b897932f71ce4d3/senolejidinumabesebipu.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/barinadurekodugasimitibup.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb2a0bd532---58704835101.pdfIn PDF document text
    • http://citranco.com/users/files/tanuv.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/20334852840.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/lalorulejigalikawet.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160781b77ad25f---filuz.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/98939681047.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/08dae01df91ffd884c4c721d96db5bfa/11137897522.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8d6b660ae6ab4b66446b40d80bdd7bab/5989499067.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///firut.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd1932d08---zomagagabonosukuteve.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/30215732939.pdfIn PDF document text
    • http://imbirimbir.ru/files/bibakedaj.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/kekadivanutobozozuzetusi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/836107f83ac8c727cd2172e3ccacecbd/kewex.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160943af839557---lawukunupaj.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/zoxujowuvopuzabetepopoje.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_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 11112 bytes
SHA-256: dcb44c65ac6b90658550a19ed85949224e40df6c756ecf8e56531b2cddd52c6d
font_01_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 18888 bytes
SHA-256: 18e1b25fb5a8ce90edf94fd41df0ee045ed78b1da605dc2dd422726385e4f56d
font_02_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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