Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00f4af78648642f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 12:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84e6748afe4cdb4c6fda82e297d143e1 SHA-1: a494d748c968166a3252ef1f9be6eab7334152bf SHA-256: d00f4af78648642f70fcbf8516aea4b775fdaf9e6c9afa5b6d7765e150cbb112
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 uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended to lead users to harmful content or phishing sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and ML detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=backup+pictures+from+android+to+pc PDF link annotation
    • https://tootooair.com/FileData/ckfinder/files/20210919_5080DBA1C1FF38E5.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/84021067268.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/xukovinepijurozedozobedod.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/3307931624.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/8779951711.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/19015463372.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/93661381973.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3d83e588---27594321267.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/wikitepelu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b5c5b98---95057209651.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48d1cbc39---wuluwuloravudewukana.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/21693471087.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/napokezidovuguwimugapipi.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/nerezosu.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_off0000a671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA671 10980 bytes
SHA-256: 428ebbe4f50facd030e611b8e4fe4856c77e4f6aaa4ffb590a8f4d0f6d33da46
font_01_sfnt_off0000c002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC002 17712 bytes
SHA-256: 3d76d42c37161bec486332cfd4cfb547a50be84ed97b0cd0c6e1d215c2f8f12b
font_02_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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