Malicious PDF — malware analysis report

Static analysis result for SHA-256 76da2580bb9f6ab5…

MALICIOUS

PDF

72.9 KB Created: 2021-05-01 04:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ca199b2c916652a6d6495fa8d5ae32cd SHA-1: 7e0c5c92c25f4fe392b385c5cf301c01318aae42 SHA-256: 76da2580bb9f6ab5dab2167fd4a783cb04664f9e4d6a7c7d86ad0f6986061491
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, likely serving as a link farm to various compromised WordPress sites. These sites host further PDF documents, suggesting a multi-stage download or redirection process. The presence of external URIs and link farms points towards an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608bde0c9c58c---29320185443.pdf In PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5gijti8purvh0nolmmt8fpg04u/15779423560.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e12bbc84---tokivikakoxutafik.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608953e29bdf9---senenixudivowuzelemonole.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bb048d8bb3c7378c9da97ba0a7b1e7e1/kikidobine.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f6b2712d---94437966784.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/56c8117d16c05f1d347b8d3795ba038a/6019602161.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97841d50d---11832985898.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ec1c3ceb---ruwaletovowipifefexi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0f0e2c56---sekufopubilufepenupisef.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14231f54b---sikimawifafodujoranijenul.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3iu95se1goec4mhlcr2ucbdc5b/76451420947.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/db6be5fe813c01b9deb43b828b0bc5f4/553513532.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160858edf080cd---zinubodirutuv.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160772547a9b42---ziguvonaxogodipele.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/fivafizurupemetag.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/5e3ab8e4a2f783dc87f768e3edbff545/13374496155.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607521d7c33fd---jenotalegorenujabudaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ntse+2017+answer+key+fiitjeePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 5440 bytes
SHA-256: 00774a54f82e3807b604ac1e3b2edd3c81261148e2b5094a68b9aa296b4e17c7
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10924 bytes
SHA-256: 749b4ee1b0ffaea28e034a4645b02b88aaba6fa7d11e42663218ac6895743461

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