Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3376a86a56426f2…

MALICIOUS

PDF

63.7 KB Created: 2021-05-05 14:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31446ad6138b1863bbfce4b926f0ff93 SHA-1: 623a697be7e9d71fb1a5d713be8849bd997bbd82 SHA-256: c3376a86a56426f29bddf309bf87fe83f2ea61402a757c918c058281c251a3f1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document acts as a link farm, directing users to multiple compromised WordPress upload locations and other disposable hosting sites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=assignment+cover+page+word+format', are designed to deceive users into clicking them under the guise of a useful document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

Heuristics 5

  • 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
  • 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=assignment+cover+page+word+format
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b98be42---38486507028.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e669035f8c---24757568575.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607faee591fda---gataro.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160864f55632db---fenejofivujuvepomigaf.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415b80c52c---42588715314.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd330d6b7a---11843396572.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/580a6656d3abb284fbd61830ed65c151/19964263023.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/m8b2m335b5fg2f8nnvd14lguu3/vubobura.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/bphljb59d2uhfi3s8pt7hllt0e/pabaza.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47d2abf02---wesupida.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777e713e52---xepovid.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b1ebc260df---51183513557.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16070a59681489---54222877376.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335a601a66---39977260139.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/68adfdea16a8735b1e8874b82ed9386e/dixegomevosanuzojotetasip.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d2ed768e---87289381181.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160921fd52ba68---bafireden.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/93679840963.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160832618d4a75---60682821790.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daea.bin
70c4add4cb8c13c4acce37cc43d2f7eb14821d4a1133ba76f23092ba6b1e33c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 5584 bytes

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