Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c3dde16a66d62a…

MALICIOUS

PDF

88.3 KB Created: 2021-07-18 08:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30e60be2d874c409bf8dfc1d0ace06c5 SHA-1: a85fa64e69e47c89f3b341ab188f8a3c86f79e2c SHA-256: f1c3dde16a66d62ab6cdd4005acd8bbd9d90b94bf08c43f70ff90a0a5ae2a301
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these compromised sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8720e8c40e---58179809110.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/bifajodurezaz.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210617_9BCFB68ACFF4FBCC.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2cbb80f3cc60b5c6f8549448c39198a8/7173585549.pdfIn PDF document text
    • http://polkovnik.su/upload/file/43811134936.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e0abcb8d359284450de24f01c75d475b/87897715249.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42066678004.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e976c7f272ab0d5cbea0a1a3e18eb86c/gunepexirumivugibuzo.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/zixif.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21063b8e54---lodopezavijumufina.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093d14232e04---makapigipeb.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6c77cf88---juwoterigidatomivu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081336011902.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/60ohcsefi0calccu851c4sej2h/37796006715.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c077f07ba5---gamawugam.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a694e73cb96---66214236558.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/53978292513.pdfIn PDF document text
    • http://orrizon.ru/images/file/71461175345.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/apueh7a7s4vuegple6lfk36m22/18131633034.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c7bdd6f8---66485942582.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/bed7ebfe0988087a84265df72451c29d/wurogufebumesa.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9d67ed98---zixepumik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=multiple+choice+questions+and+answers+on+biodiversityPDF 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_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 11256 bytes
SHA-256: 5c99c05ba94351161b9b7161db6d01e2c71982c77261e48fe2b9cb1cd6617885
font_01_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 17164 bytes
SHA-256: 523fd6835e6b337eef78196ef08d6b51a15f2aca79b31ad0fb64220b00eb4cf0

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