Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f7d2f036c2e680…

MALICIOUS

PDF

97.6 KB Created: 2021-07-18 03:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f494dd2a84ca8feeb973d3c43709f4f4 SHA-1: da76894b9f4a34cccc79491164262d62ad61c977 SHA-256: d5f7d2f036c2e680d289e7a17787a35356533024823b2f32693f7fbeb3e9ce1f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting and potentially compromised WordPress sites, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae4436693---xafijisexumodakoriribeja.pdf In PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d669e35dea---78698033025.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/9654774126.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xidigejuxiduzilinoserunaf.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/dbf9400af386cb1d0f32a517291e544a/58649356774.pdfIn PDF document text
    • http://qa-whg.net/upload/files/ratisokam.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/fonivemitubonojapale.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/finakabavuwugeja.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ldlf4vge62koq7timnjo1addg/kagafur.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/regijixazevukuw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7dc16f9a6---45261613810.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/40096792919.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/tatibuxefini.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/40792560847.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/ee543b04663007c6cd197b43a50adcd6/pagakolavadipowigeninom.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608739293c452---fenojusedogepajijerefumup.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e11bfaaa57---66111585467.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160796fc85ab02---58565144646.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3014e2bbd5---fotufutanugetaratotami.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f4877c67c5245dc6da6e2de7d781c7ef/70664393298.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mio87t16p391easkoafnhj25tq/81861715917.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1622979489.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ial6jgrkgr86am49gfdetsm1p2/30689826162.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda39efd40---wiraxukufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=soulful+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d88c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD88C 18836 bytes
SHA-256: d1b6210730b49773ded60ff36aa5139be9031553408c0c03fa547e780ed9557f
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 10464 bytes
SHA-256: c49f0d425107c6fe7315089ff42b210515684ffa55db597efcb1c1f4df4e70d7
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 6432 bytes
SHA-256: cd0cff08a998df7c09c9a83d3cf172c20fe4d471245643a26ac75404d69a10fb
font_03_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 23840 bytes
SHA-256: 3d96b3b967bf83c6e984618aa0a580f7251d3fd971ab6c341ef34c108a9c4ebe
font_04_sfnt_off00015fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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