Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e05ae90725eb60…

MALICIOUS

PDF

84.2 KB Created: 2021-08-22 01:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0c2862c841cf25ea0331f83217a3d53 SHA-1: 09d8e31c16ff87b9d98bc20d5029f439f500a94b SHA-256: 21e05ae90725eb6045afc4b9def6150b3d7fcd73b099228d4a612161cdd523b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://kede.org/userfiles/file/bexeninopanasipaw.pdf In PDF document text
    • http://ggmtc.net/userfiles/files/54696090626.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/dedotivezabo.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/21850578180.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/61863614560.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mafigunepubadu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sotosudagukesavus.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/gizimilojuzejados.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/4165551064.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/359bcf2caede7177fd60a55b6413ec02/bunukasajewefibakepi.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/93536899243.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/kjpi042u9jd8fss8cevhih6e87/nowezelabizut.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2859fd1d44---53774223452.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/35475910184.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/55566469438.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gobiwimapirisami.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cb604345---fafipoziwejo.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/85475658511.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witixudof.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/96d82266b4a803cd94079edaed61f408/savaperewelimuwezu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0c91d3d2e4c4290e27ed6abdd5a9e534/vatidivefexonugujo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fd5e1854---nodarizoruxupurek.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e303a5bc---gogufozadugaxi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608856d72eb23---sexenedafa.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d99c2dc228a44b0a4daa2bfecf432a05/nawuwijezu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/dolepupetarom.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3898a02055e984fce0c7dbe358a4c696/10855261944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=auditorium+acoustic+design+case+study+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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 17500 bytes
SHA-256: 5e4cc7e0b071df35d6719db11e3847fcfc8f8a969fc29739acfd1057ae9c1e94
font_02_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 11112 bytes
SHA-256: 5f23a97f0ca75b4046ed2be8cf5971f4a1fbbc7b043ffd58364e92506dec6e74