Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b178e909dda5fd…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 05:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0302d593f4d808525294904992c4cfa3 SHA-1: e93c7c0bc869240d706d495223f18f9cee942d2d SHA-256: 34b178e909dda5fd7e73d6d138cecc55576d7df10a20af77054bf73df7f2cd7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or hosting malicious files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are designed to appear legitimate or to evade detection by using disposable hosting.

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://cructi.ru/uplcv?utm_term=best+photographs+of+all+time
    • http://www.masozilina.sk/ckfinder/userfiles/files/muzanapejuf.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/03ac75a90f2b1a0fd78463758a0ae8d9/78496170770.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/it8396s590nd3ognoe3vn1b0hg/89615913100.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a3b6d12a9---10009544899.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a63b9888---69204422327.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/37bej3nki9m1vkd9iprtgm6fa2/gejupapetufinokorad.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/46e8a8b3cc74e8b00e76aeedd89f8d8b/nuzilufesi.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/30606770131105ddabdd012563d3083f/16625999175.pdf
    • http://centronegozi.com/public/99686571778.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87b85ee1c---tiwibiwinoveripugane.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/5b44e3919020f38048d1006a9043d918/fomifapuzo.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160795919a1c34---60973838653.pdf
    • https://people11people.gr/uploads/File/dadanubolukefipis.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f52033f87bb78af343f9192b7b7f1d55/godijowamoxolegat.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78272d9d1---sefivesudipigobipefofa.pdf
    • http://mea-travel.pl/userfiles/file/logonuxokimojevematos.pdf
    • https://chp-travel.ir/data/file/nikilomigutikaxorinug.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3452fe52---xudesagalozadurut.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4e211041bb72b22bd8c62a0f0d21798d/nizukobanolixape.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730282583c4---vegosil.pdf
    • https://topclassgreenery.nl/images/file/47688827749.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69f66d352---giwedizatenegav.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79b8abca1---sebutazitexisuxuludax.pdf
    • 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_off000109f3.bin
77c944d916c6558c710aef5f662158992bd5c7e61a0ce626cd0e6ff8dd4d5361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 10756 bytes
font_01_sfnt_off000122bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 16792 bytes
font_02_sfnt_off00013acd.bin
c24d6b8a8a81ea03ef7dd96d6ac3486a3c748dbd2032e635d161eb9b284375d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 17844 bytes

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