Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80779f2ac8cd039…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 06:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ec16d66f45b54ac0f01cca741db11f0c SHA-1: 5a7682fc38e7afc8515a8554370eef2a4da0bbde SHA-256: e80779f2ac8cd03933a623d621aa90bbdfba0be1f6a8e7a62e17cb546cefb7c7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allmedicus.com/userfiles/file/divuzotowogusetug.pdf In PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/gapomi.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/fefuvulojupara.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1483bf03bf5d6b10bc0a6768eda54c11/48340765549.pdfIn PDF document text
    • https://sharenkon.com/files/vatisofadaketinezupuxawu.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/26090001559.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/gumabugevitibuzowefola.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/ditad.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/66abe610033f113d17c15ebca729acb8/vupaxunoxavira.pdfIn PDF document text
    • https://marosme.ro/hirek/file/desikopugu.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/c283971a35c5751cdc99529fa4687d24/tigipexogedejizomujuv.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085693f7b526---24269157349.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ulaph3sp1l2h5v0r7ih809icm3/netigefajejupurupafira.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/gabezujawijejoga.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/46b317406d101e9c168324c6dfc0bb81/pifewe.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/jeworexonovor.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/5035278862.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a408af972170f0c40fce8d33b4dfe716/79663079980.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/98299081839.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f4e6b9d68---72618037328.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b51d15af3f1---rolusiregemexo.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/kutanuxapamugaw.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc0f186ca3---50258703832.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0r9amcckctumofojvfhckunemj/21394641708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=it+has+becomePDF 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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 10244 bytes
SHA-256: 5b1855cbc5ca8183076fa798d3173a7dd953a1c0032f83c859358aed71c03637
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 18544 bytes
SHA-256: f774b7e27fc1170bb165502fe7382a279dfb393889335c6f1a21cec2bdc26000
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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