Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed93d7ad7f4bcc99…

MALICIOUS

PDF

77.8 KB Created: 2021-06-28 10:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9f8e4dc15210bf1bd425a610810b0a03 SHA-1: ee1e98a617c1c9f888711735a777daa75eb484de SHA-256: ed93d7ad7f4bcc992441796d9baa5d02e79a1a8e2e3a93c31ed7fbffadcc383f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised WordPress sites. This pattern is commonly used to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/169670b591dd7534c9cdc415762e7cef/fowiwejiw.pdf In PDF document text
    • http://commune-bourre.com/userfiles/file/monabexugurivu.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/gikasuzakuvuxukat.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/69159810973.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/72221a77f66ef7137e25af222f29b72f/begitinodowijazixewejelej.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6e8492212f21b3eeedbef790910efa75/23777955219.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b1a721c83b73e9f4a712b3610a5e56d8/26234782677.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210614_042950.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cd3rl64mmirjjeqr55u0klflo5/99705649986.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f0283fd2b7abe9750e7c25b1023655f3/dulifadavurikijukixesu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2df346a9---39728461457.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f847599f---97540912004.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a4218c63af9c3c86525cc09de569ec5c/94610275916.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/sqd08advs119fqp1iu7abub1p4/29507934445.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/414967964bd5a381e3e9f1b3b8f28b65/2717697338.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082008c198df---82204283758.pdfIn PDF document text
    • http://bichvan.vn/upload/files/22394727163.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/8ol90slqh9dije2ren4banird4/dikumuz.pdfIn PDF document text
    • http://naucseto.cz/storage/8161463868.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/seliponololupunubajo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fc7e57d3c6ddb8b19ac72fa3ab67f2a4/76345637634.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/a9ee93e1b9dc2e9c849a34dd9810f332/kobiso.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/146bab8cae0ba54327cfb9dc8fcf9747/rozevajejesotegewebutofer.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/kasusazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=social+differentiation+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_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 16472 bytes
SHA-256: 6d26376d58d9a5b88dec2f1c018910e3d091a2c14e9cf0e45cc4f8e66ebf0810
font_01_sfnt_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 10520 bytes
SHA-256: 2576939cf5ecb815a1661a7ecebae2fe3b77e5720c78ca4e928ab933f826b0fd
font_02_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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