Malicious PDF — malware analysis report

Static analysis result for SHA-256 628ae27d6cc6c042…

MALICIOUS

PDF

80.2 KB Created: 2021-09-02 22:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fcbbc9c5a0460d3ca91a9e4c80f0e0a SHA-1: 44e6fbad40fa6c0b1aea7e44d2cf3a1db0cba7f3 SHA-256: 628ae27d6cc6c04226105bbe7fe35123cb31f8572a6f30eb3e2a9518df6b8dd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, many hosted on compromised WordPress sites, indicates a link farm designed to redirect users to potentially malicious destinations. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/55368422290.pdf In PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/25462712637.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/51796351140.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/tusodovibitomekufisar.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/sezapipalebomegadawexup.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/2524171704.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/tonitaxilefudavuzo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4922585f---wokobebenamopoxudoto.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/36695989902.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/rukevimipepap.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/91265910692.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0594625001622797673.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a52c267df72d5bd03d306214a28b0e9/vikedametiselitavupotuv.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611fad029a82b---newemomaxelude.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/lomedikumiwagapokoz.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/rimipowenexotosapi.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xazoruzaguw.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4ec451f2387e896974177b0c5ce1eb0d/96370399687.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc45a21aa4---leruxiwefanumubelik.pdfIn PDF document text
    • http://innotack.com/userfiles/files/valozipotilem.pdfIn PDF document text
    • https://egca.fr/userfiles/file/wakitazini.pdfIn PDF document text
    • http://planbmedia.hufiles/62121303805.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/xogek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vbscript+basics+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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 10320 bytes
SHA-256: 86461fe9250502cb8d300610437963c4b974ed35346bb0ce6ab8e2932a8c6689
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 18024 bytes
SHA-256: c08900142e3d72b8dd9ec3bed6cd07cc9bda9246e010dc93df2c5d315aa0d696

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