Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbac1e83c3ac7b4d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 12:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ed9fb0e601762af68bfb0d4cf546e53 SHA-1: b92faa0fcc1c473448c38c5930729adf42b68e94 SHA-256: cbac1e83c3ac7b4db97dda718035e6850c910d85dd77e3d3e2105aced376e903
156 Risk Score

Malware Insights

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

This PDF file contains a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to lure victims to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://netron.pt/app/webroot/media/files/21687874241.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bf077c704e833de51e5493a1d6aa69c8/xisevejos.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7pjv25o8o99mjk0crf7oud3tqn/jeburimenagesulabupo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/36916808586.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/tirovu.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/27642563745.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/77842898532.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/24072633724.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/54604050955.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/53166842944.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/sirekeve.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/cpn29kupltbep4pf3gf4s1epue/xiworarefejekal.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2852a8d931---firevu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af60f35410---71215805470.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/575brstsq7dli3bvs6qg1kfrv7/vewewanisimuv.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4782f6fafa---51008747960.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a3245527ec0---maluz.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/509q8rh5u3i2k8rrj9mduanquo/saneb.pdfIn PDF document text
    • https://ikima.fr/uploads/file/69807906898.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/totekoton.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/risedoj.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af60b0b6d65---ligaxijanu.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/83824312036.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/gepanet.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/xaxenekupijuviwof.pdfIn PDF document text
    • https://amblamy.ee/upload/file/zifudajix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=aircraft+sheet+metal+work+pdfPDF 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_off0000c032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 10940 bytes
SHA-256: b30a05247984e6d00570914596e16f4ed32679d0617a08af3b08f7bfb3c2e6ed
font_01_sfnt_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 16804 bytes
SHA-256: 64472fcbe97b7aa5ba801c193706b4577d56b2263cb270e43d6341043a6c7b07

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