Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23dce0462d46343…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 12:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 03d7d938085ae4dc9b974ac35f9ffcbf SHA-1: 2665d8e1c370590fc858c506d3128b1e22c79f56 SHA-256: a23dce0462d4634384c0baaee4bd43d008c8ca7a9625a5ca82a43fddae769cdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=yorkie+chon+puppies+for+sale PDF link annotation
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/f9b6b1f9594113f335b315074b3f94e4/38278643829.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/filiwabinuruw.pdfIn PDF document text
    • https://aromamarketing.md/img/files/topuvaj.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/70258734759.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/furason.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161520605d76bb---dapopuxerojijevuw.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0a2e2eed4f6e0558d652d2b5aa20ec7d/fefapil.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/74550705719.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/lubow.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/82364558270.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/2883541975.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/48781195359.pdfIn PDF document text
    • http://siangyun.com/upfiles/editor/files/94734301535.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/tozerikikegefejorejale.pdfIn PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/sizumemenujezesute.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/14041749652.pdfIn PDF document text
    • https://artgalery.ro/files/file/vasonaluluvitetivilixotij.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/finaget.pdfIn PDF document text
    • https://conrays.ru/f/data/pubidumutuvuvovo.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/99488350600.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/lelevito.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/zevoligan.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/fogivekiwerelofudo.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/43764298413.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lisivoberi.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_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 14588 bytes
SHA-256: 23ac0f72f718be3d4fc574dcc074272831c647f9d60107b06080606645e7fcf5
font_01_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 10652 bytes
SHA-256: 2efcf32e9bf4906f963f96bd25a9b124a23e9de81f481f1cb48a6bce07c15f7f
font_02_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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