Malicious PDF — malware analysis report

Static analysis result for SHA-256 56392f2e9b0c0eb3…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 11:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2bb6eaf0155d4a2dce6ddd2a0d528881 SHA-1: de95fc5cc78b508ed49e28b952c8face82c26814 SHA-256: 56392f2e9b0c0eb3a014aa32db25ae24f8d31a85b8cc207ee7fb179991445aaa
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting. These links form a link farm designed to obscure the ultimate destination, which is likely a malicious payload or phishing page. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 http://ledins.lv/cms/file/rofewof.pdf In PDF document text
    • https://shibbirs.com/media/files/80273977728.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130061723c71---rinuz.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/dudulefowuruwuxo.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/javeginikubafuranagizuli.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/73262523789.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210919_2C7ABDF91921B23A.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134857eccc81---bikujedukur.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614156380eda1---sewof.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109091949243653.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/fijilipopivesozajaz.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/bebevutefefirujiv.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/tuxedugewob.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/49359543245.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d5e2344bd0642a64b264faa33c93b2db/16416351627.pdfIn PDF document text
    • http://mobiliteit.nu/files/jofona.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/3602440181.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/xoluxebipifoson.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/49915346882.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/834180823.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/71601364216.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///59583229327.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/50455266010.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b87b5a788b---jewat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=du+u+recorder+apkPDF 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_off0000b3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 17320 bytes
SHA-256: 864cd3307d2a2339a334039d10d3ec27a94566addfc9b75e69de063050e9a4f1
font_02_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 10192 bytes
SHA-256: 95965b611eddceac5742e712f6e6048a73de72e9588f1dc7090f9a4b4bd9bd36

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