Malicious PDF — malware analysis report

Static analysis result for SHA-256 58423dbfd10a64fc…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 06:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f53655845a2e2f5edae4a8af0252464f SHA-1: 221cf87a356c750e2d05e81ccab9477383800b39 SHA-256: 58423dbfd10a64fc333c2f9478f8fdc11ec57fdc8dfaa646032a0898d54c165b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e76003c0f5c---mafolefafololinip.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f684f122123---17371249013.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/91521344043.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/remutalemuwekedemu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096206657b40---gamukowuworuk.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/64e225f219274daf5d3001b3debdb853/rejubozelofusunero.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/6e11013hktig4jca19im88oip3/xenaxitarizokosodega.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/fipawatuxulug.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2e8ed96d---temutasivetatoxujagi.pdfIn PDF document text
    • http://vina2002.com/uploads/files/29759914985.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb71f66efc---kalunofojewifepiri.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/zukedixinaxofurupokifogig.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fde1637591b---kaduzesekezoviwozil.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7738806db6e19f6076bf3d0ed7f38e66/dupetu.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/boxubokawilebifona.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a0a96a38b2953d3d2136dba852f5a6b9/parimizifimozigawiwa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecead0b639---naxebudagugenadem.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514212908163.pdfIn PDF document text
    • http://szwygs.com/upload/38850849358.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37d4823ff0---33688825159.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/026eaf0e781ac5adbd48e413ad526b09/jalodobisozexogujaluk.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/15815493075.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/22163051758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=verbos+irregulares+en+ingles+y+espa%C3%B1ol+en+presente+y+pasado+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_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 11204 bytes
SHA-256: 98c6dc8e1affa0cc47595a065d26245e88f1f6584d023cc84fbf77290d81a76e
font_01_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 18212 bytes
SHA-256: 96f1074851502edebf0f15665b047712e35524282aa0d80f7ed1550a6a2ad8e5
font_02_sfnt_off00013a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1