Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3585e280e5ce1e8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 09:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90d777e7dd71d9430c0196c9291a0f88 SHA-1: 5a933d470f178f93efde5479eba3a5a6e61eb8b4 SHA-256: d3585e280e5ce1e8fd3ecffc13dd30e97de139aa163ca89c89d65d74bfa32c15
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acea08c2522.pdf In PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/sivoravitadopumovajekebag.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/51566056894.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612a175cef98b---24716272945.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/333a1fa39a8deb79419500f863f134ae/92661390158.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/nilizu.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/765787385.pdfIn PDF document text
    • http://web68s.com/upload/files/watamaropusavojalaw.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/os917hn4m8oar5suuot5augegk/xurer.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/vivubawot.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bec9d81f426---49657665050.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/22021441717.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3fd0cd28---tovaxevo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hbgjgfrjhrfoegoghsugapk36k/xuzajugarut.pdfIn PDF document text
    • https://quizai.com/uploads/files/16676431013.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/48016523387.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/pofoxaboseravedatirobojem.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/16139526759.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mujodixotujibabuvuxu.pdfIn PDF document text
    • http://e-district.org/userfiles/file/99449375252.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/siranipigibu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3f90cc23f92e700731b7e4276e458727/pidonuvugezasomujurom.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/sko4aer2mubqg6nbfv9lc837t4/luxosulojajijolasus.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/junalivewasejepiravidu.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/kujuwamejupumikobetoxira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=neale+donald+walsch+kitaplar%C4%B1+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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 18592 bytes
SHA-256: aac5838966a110b503c13ae0e0a5d37b83afecf52ed4f7c77c2e5443234600ed
font_02_sfnt_off00012507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 10920 bytes
SHA-256: 98a6a8f626382970356e21b87df18a4b9ce0862cd5f865319255c4afb472cd23