Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba3e907954ac1ed…

MALICIOUS

PDF

86.0 KB Created: 2021-07-14 08:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 502c1c2de7d88b7c566f78528214857a SHA-1: a5d61291a8a0b811e06cadc99b5ca131b23f2ba2 SHA-256: cba3e907954ac1ed2bb9fdd23f409f31bc9cd00f1b34b9b153f148c03d7e7ef2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/140acb99e061e89b9b34db0f397c6c3b/22750348970.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc702f6b3---93962505099.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b12a82cba---dulokadibekor.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/aqm2o727999vpji1kcp9kv9ai7/xexupevugigodosidenopi.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d84353b0---54554375420.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160840783e7ca6---gemif.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d03016ca7e5---34977623728.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ad50fc31cb03e7b1299b8069973a8a9/68184628423.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mftuoej0vc5cjtka0ap0v48t10/95087381676.pdf
    • http://mppscstudy.com/admin/usercontent/file/xeguxexolawexodufajeru.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ek13i7sohu17nv1kh59n16ph56/80673080733.pdf
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/85666563702.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/ajqgkql6tjg3vqroclo6kfnd5i/koxurow.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/xunijazarajesujiso.pdf
    • http://harasim.cz/uploaded/files/34495035703.pdf
    • https://ive-cal.it/file/37419462352.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad84594c67---rakinagakozegofira.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7efd2ca209638987e747bd8e684bb660/85185324884.pdf
    • http://vce34.ru/attachments/file/musore.pdf
    • http://sbs-group.co/userfiles/files/pogunawilogubilaw.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad75c8976dd---52668108150.pdf
    • http://msslink.ru/userfiles/files/fexanadu.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/6463184089.pdf
    • https://aadharshilaschool.org/userfiles/file/56018374713.pdf
    • http://abwingsva.com/uploads/files/49922608577.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=800m+to+miles
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee01.bin
e35ac6f575be69fc274a3f820ecc331ef7bd762f5b22d9304352dde784345c40
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 17588 bytes
font_01_sfnt_off00011c42.bin
b395e9136c3c07b2ebadb8ad7aadbdf16a44f4a3d91fd0d25096b9882a42543c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 10136 bytes
font_02_sfnt_off000132e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 16792 bytes