Malicious PDF — malware analysis report

Static analysis result for SHA-256 a085803006e3918d…

MALICIOUS

PDF

122.9 KB Created: 2021-08-17 20:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fec403d3db848fde6f803c144711525e SHA-1: e20d391e67b558e6b58502e6abd5a2c066d5b17e SHA-256: a085803006e3918d67e975574a2f72ca0775c217f8a276b91655c3f75dcbca65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160be2aaa51ee7---43340234101.pdf In PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/51303597860.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/lolurexili.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f7691cb8---12104539539.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/16843011372.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/lerananabo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df577e46f5---fidesasimapabapapalaxi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6c9cd8dce2a3a9ddb6b45a75cda83e79/91205365372.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/40133391684.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/2076341590.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d5b08ae8236628ee9370d052eaa70934/zojudutopabupobadunow.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/meregukuxekipikezof.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e70e720395---23784538334.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nunameta.pdfIn PDF document text
    • https://123natura.com/stockages/files/9110312171.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085666b787f8---65155849830.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/diduk.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kunozososulera.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/migotebatobu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be6506cf6---28367600763.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/xegiveganato.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunidivevipegenawur.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/79449301739.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e0868b22282d8abdd734fa47af6ffd49/jeragizalekelejesopozonus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=psicolog%C3%ADa+educativa+anita+woolfolk+12+edici%C3%B3n+descargar+gratisPDF 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_off000179cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CF 11368 bytes
SHA-256: 0b6051572ee0c5039378b2faace8a6de361234ab4194a0d88eae0303cfa3b4ab
font_01_sfnt_off00019473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ac85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC85 18264 bytes
SHA-256: 02685f942ab6050b797e330f8a2ee4cfbc64f2d270d28dbec97ac1eb3516c75a