Malicious PDF — malware analysis report

Static analysis result for SHA-256 564a845cb753221e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 10:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4200a4e8c542c008dabc36b6b0eb352 SHA-1: 23627baab38f61e2bb405c3282b17c7def394201 SHA-256: 564a845cb753221e621a8d522166e390dd775b007c8b9e4939a2d006f4e63d94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and the ML classifier's high confidence score further support the malicious nature of this document. The primary goal appears to be directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ketchas.ru/uplcv?utm_term=cinderella%27s+hot+night+123movies PDF link annotation
    • http://adasbruiloften.nl/userfiles/file/13594614609.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/nepegit.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/80899031716.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/26655091985.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/38e2a63493f318365007a12429654934/nopenowo.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/84034582714.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3fad2cbf0---349272384.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/vedosusodotagutuzunijef.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161318c4e44f66---rajonoxebaxem.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/wejekagovopoxafude.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/fotifixamosefonojas.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/677742136.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/27735930507.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/12414609075.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133976c9110d---25152012580.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/zadadedajopaxux.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/8qabrq8qoo8rgq64qkhreqfoh1/48703787919.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/batubebigokipokojek.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/78099432789.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/75251348427.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/xevoxiga.pdfIn PDF document text
    • https://castel.ro/userfiles/file/lebenegakapesutogeximagin.pdfIn PDF document text
    • 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_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 17528 bytes
SHA-256: 46478b959c6b5410dc9f4e3e40ffad8f39e710ef9d9f8948972b219ae73519c9
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 11168 bytes
SHA-256: 06fddc0873e437f3d49014fdd806c6d197624b623dd911b7cbc26a1e1abffdc9
font_02_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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