Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15312e7eb93e283…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 02:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f09ad4b48fdcbb0504c1b4220538d6f SHA-1: 9f7dd6d907b4925c641d8a21c0f60b077000ba52 SHA-256: d15312e7eb93e2836ca3d0a4edf8315f759d2250191939e73cb4c5395f91f23b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to lure users into downloading further malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=stella+by+starlight+victor+young
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5f1315c8---26993317490.pdf
    • http://epoch-making.jp/js/upload/files/loremerorilajejebom.pdf
    • http://ehomeforeclosure.org/images/file/tivumidaloduforisigob.pdf
    • http://ozhelalikram.de/resimler/files/bulugirugofuvupukozisesef.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d9c9e2586---renobowazarulirizatebara.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fa66599a---52221122735.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db5dfd214ea---sisaliwifujabobo.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5ff4305c65c18c8d6e5a06a18f03d47/faberifufipi.pdf
    • http://classiccar-jp.com/js/upload/files/powigimalaxakin.pdf
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/farukulewuridalelozopam.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609845235d96f---wixoduxofojagudemisakegi.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/13000316218.pdf
    • http://angelescare.com/userfiles/file/lisepawavozovizumosofefu.pdf
    • https://aartipalette.com/userfiles/file/varapudadopofumu.pdf
    • http://grupopiscis.com/upload/files/81793064822.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d286d5ac---dopidubotog.pdf
    • http://www.cbs-emballages.com/upload/file/51255155087.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e609011fe5---85137620078.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7babb31b177ada7c45a6464f934d8e17/kuvagulitikifije.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uu85o2e2gi0e9toneutf8g25ih/bofovofifuzirogobironig.pdf
    • https://camgloberealtor.com/userfiles/file/49040383622.pdf
    • http://royalwedding.jp/images/blog//file/nezamibesedojuliwe.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e5b19007a23b105bb76b59b57760b217/vufurigi.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d042d7ce---57429056781.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a5f03c88c0711406446475354e95af90/48335522196.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin
c235b2a43a79c18b98a98bb333e6d5ec6079246e3b305f8a61a2e232f2a7a2da
pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 17760 bytes
font_01_sfnt_off000117f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 16792 bytes
font_02_sfnt_off00013009.bin
ab055b5be9891414e90f850b05efffc0d237ae80773eec21f09179bf732ffb38
pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 11004 bytes