Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbbdf29656a7cbc…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 02:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35ff40c7a290ea8e4c87d5cf7a007c5b SHA-1: 34bf327f8563f04a48ed75a4cac50b583bd193f1 SHA-256: fdbbdf29656a7cbc80f26feea1c035afce7939f6569cebeb2651ded0d27946f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URI links and link farm characteristics. No scripts were extracted, limiting the analysis of direct malicious execution within the file itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://queure.ru/uplcv?utm_term=comparative+and+superlative+adverbs+worksheets PDF link annotation
    • https://jnvhardoi.org/ckfinder/userfiles/files/17229655438.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/96982455583.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e4258ddc---mevasapiz.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/2ca733394acf32b861209e30b689bd08/27139460028.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/36b11686ab4c541141ef5725870b4463/zevesadoxeburevuf.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613755f637c72---2670051069.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/rivomirigez.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/88034600486.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/ziwovosexuzifiwububot.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/055f9fd277228113cfc2170b8c8570da/41789311865.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/19260210137.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/xuwozasixepu.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/zuwimotaruj.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/41331364576.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5824b114---70314788730.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/lodafugamujuginad.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/63e94e4c1d38d284e19ffba67d2fb3ce/jidabijef.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/9427354092.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140931829e07---kigoxemavilitexebi.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/bofeligidu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r635ne0jikc9p50uub0v6066v7/niwitok.pdfIn PDF document text
    • https://ancoraeducacion.com/images/60475903798.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/fijowinariz.pdfIn PDF document text
    • 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_off0000bcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAA 17168 bytes
SHA-256: ee5ae192ba0d24867808bbde3b501a25a87532da4c34776bec7d1ebf9a43cafb
font_01_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 11172 bytes
SHA-256: 395d904e9b415b486d38449afe96b34987d8ff54c321f42bb7a008954629b91e
font_02_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.