Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece67d74219c71dd…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 01:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f60e7953783630918dd96c24d7ee67df SHA-1: 5d2f542b01c025c2f70b196818bfa4c713158fb5 SHA-256: ece67d74219c71dd4f09460de5280679b4bdb0fddc4067bb5ca5e8b88ed202d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, specifically identified as a phishing trojan. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19e8dc3da---sizot.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106920e4389d---64489657437.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/n3lsu6fli1ad4mflkcp7c7qg83/jopasawiteponibavawuzav.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3abfb5b9ea9b7366717017ccfad79c52/51623969729.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/10022689542.pdfIn PDF document text
    • https://triosms.com/userfiles/file/19325977594.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rafinasujitoramudifa.pdfIn PDF document text
    • http://asqcert.net/files/files/81287792423.pdfIn PDF document text
    • https://giustofiori.it/file/32786425991.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/livowisirakilura.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/68562224464.pdfIn PDF document text
    • https://ksboutlet.com/file/files/38718464858.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/zarir.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/39337987344.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/90832692757.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/69b05c82fa080ad9a8c8ebbc54572bcd/3618955398.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3a728993f---4975557332.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/67648774192.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612155cd646b3---35521843816.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/be87caa1e1fc93b1404ab0cda19bf8fa/dofazuzogexagajudub.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/73784258960ee1b4fca954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=manual+do+homem+moderno+lojaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 19792 bytes
SHA-256: 92c8536d470c39c89eee3b9da056a4838f213ce9dd3bebf77d9703d9042df72d
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 10380 bytes
SHA-256: 15202780837694ba1ce5348cc1f1a0b3d47c057e0b9bfffd66c18d4d2b706e47
font_02_sfnt_off00010d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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