Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7a5573763697ab…

MALICIOUS

PDF

77.2 KB Created: 2021-10-06 21:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b03047490b70e3d31615dc22d04ccd79 SHA-1: 2c323f01ff6ba039bc1bba2be1e76a3e515ed67c SHA-256: 7b7a5573763697ab856ed8423c701384cc48901a2c205f930f1944e5ab6bf132
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=circuit+analysis+theory+and+practice+4th+edition+pdf PDF link annotation
    • http://homearcky.nl/userfiles/file/zumexesadopobi.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/xasus.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d516950214a72f8bb1ab937fb2923006/ximutitu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/203346d181ed1401c26477b9ec6c7360/58885917925.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/soliwipumejopemiwopokage.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/44e43d36070100b16f5f7ad7a01d3525/putoda.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/77226258739.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/volubobuvuvolojibu.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/relataxubujasud.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141392e4f988---6404347383.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/xixuzeberunatajiko.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5365b8abcff19fc2003ceccaf4cd19e9/56703076922.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/musojawezabosapaze.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/juratekagavuzewufidatetu.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/kiripowonimovefemudineb.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/23293003346.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vejekesagofukoxik.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/2015519996614bc3e116172.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/19743987850.pdfIn PDF document text
    • https://tepihtrava.rs/files/47171653715.pdfIn PDF document text
    • https://umartravel.com/files/sexuwarezogi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449e8884fd8---89239109110.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/pavanasibow.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613432855399f---74753588932.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_off0000c468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC468 18656 bytes
SHA-256: 25fe3d7f70b13cff96f645a63b31fd81caa8ed8167bbac94bab9e14ce908bbdd
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 11040 bytes
SHA-256: 7e60d7050ac6ce7451e51b562c2b07cde19f8d8368d55ad878700a18dc0ab137
font_02_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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