Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e76fc847389cfc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 23:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d9f29a2aea9e06bfc28459b96cc69662 SHA-1: 8f9f5b39e5326d468e3602bacc9523728cb256ed SHA-256: e2e76fc847389cfccd490f79fbab386251588e603a9ffe3125d5fb2c391a3671
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mimpi1pusat.com/contents//files/dujenuxovogeno.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca7b659bd---fabumuza.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5e65ddeb6713b78bbe71bc3426fe06b5/76881155882.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/74797663806.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/38625689778.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pejunike.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/52323983900.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/22781220058.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a4f07bd4b---62254630073.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/wevotafisotiwekaseraj.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/47374752607.pdfIn PDF document text
    • https://magatek.com/documents/file/24499568784.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7a493c1d7e---rofas.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/75033237353.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/17919570400.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/12053071617.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/mumupujesafazodazo.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/12351371455.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2hj60ml0ejn7oq98uca2430tq2/340746291.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/69578542320.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62ff979796---81368281640.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/25325329228.pdfIn PDF document text
    • http://domplus.su/userfiles/files/26454566627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fibroadenoma+intracanalicular+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_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 17804 bytes
SHA-256: 54b7683cc5be697a20bf6f15600f5a9198b9ed21282075e7b4820a9a85611b27
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 10832 bytes
SHA-256: 7af4576d76b89fa4a13a93a0a1062235a6696d6d1e7b11e95960a37f0b2bb42f