Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae65f9aa4b0778e…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c95e39a9210e1b897cd84af222f7226e SHA-1: f5d0d370516a0dda87786b7fb28000f85dcf8e34 SHA-256: 8ae65f9aa4b0778e1869dcbd9bdf62014aeacfb997fef23ba6d08610e1e38130
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is structured as an image-only document with an action trigger, typical of a phishing lure. It presents a link farm pointing to various domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chcial.ru/uplcv?utm_term=ccleaner+android+cache PDF link annotation
    • https://888nv.ru/userfiles/file/71809813387.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/wesogilifesuwewadedejuv.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210920_0AEBEFCFA617C1C0.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/tolefi.pdfIn PDF document text
    • http://tfforming.ru/d/files/95370399950.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/nijivavejolatonegeruduw.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/namirijojajiderotos.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/vexaxonefileko.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/raridiwi.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/47923114749.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/83829993649.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f52b710fb4---90319742401.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d4eb0ae5dbcc0b9db9de0d8e71822a51/46080701324.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/vupexawaleramovetodozo.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/66068074215.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7aac1b910bd2eb83f0becdb093a426d9/kumisajulopegasixike.pdfIn PDF document text
    • http://digifast.cz/userfiles/sewaxoparoj.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/46921257419.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/gititova.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/tokazikiwetorotoritaja.pdfIn PDF document text
    • http://seamacros.com/upload/file/4376335125.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/94706374876.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/rezenapirurumabobibu.pdfIn PDF document text
    • http://aven.su/userfiles/file/midavonobuli.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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 13820 bytes
SHA-256: cacc6af24cb0b099a927280ed8b8f6ce85ffe79bc2c84d17653123fa6f2e581c
font_01_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 10232 bytes
SHA-256: af06d88435b300a9a051b29dfae8214c21bcebc705dc85615eca75d9a40fc6f6
font_02_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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