Malicious PDF — malware analysis report

Static analysis result for SHA-256 140f22dda16aa848…

MALICIOUS

PDF

94.6 KB Created: 2021-07-15 22:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cc2e4c193979383512ec0746466470b SHA-1: 86a3662f5fa22ad8621245066d55f25d12656452 SHA-256: 140f22dda16aa848f556c41e14510a8d33fe038b74b47268b7d37bb041f9894c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16083769b862c7---mekojapabexexemejawibe.pdf In PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16214436071803.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/sejitedusuzil.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/betog.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/49752465610.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/40058914685.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/mixotam.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/nomuj.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d18d41a336bba904bb0f67e17e674dae/19839025296.pdfIn PDF document text
    • http://airfa.it/userfiles/file/rakawelidog.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad91506cf4---gixoburaziximivadenosote.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/83676772295.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e98748c559---8732090389.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/bimepala.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160acbce82613f---98434792347.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d875f34a0c---12233213843.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/45967519662.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e422b184ca---deketozexeravux.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9erdbef4vsk4rlku3t8uqh8l8s/dimoguti.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b267b96b279---basiwuwebunazavosu.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/kebumafuzaguzonotujife.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/nc4r3kp3hsi69ms327plns9f07/25376678216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+brower+for+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 17268 bytes
SHA-256: cd212b336238cf07a6fe5e8db1b00311c2276424ae13c2773041bae82792f639
font_01_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF3 10536 bytes
SHA-256: 87e9e0f59a7956702135a2bfd1a429a22cc143d1ad99b6108b914e939c00b0a0
font_03_sfnt_off00015629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15629 16080 bytes
SHA-256: d9b8130aa6f9633ab3de79ff31e2004108ab7689d1c7a99745aef320e0a208db

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