Malicious PDF — malware analysis report

Static analysis result for SHA-256 9654017cdd118378…

MALICIOUS

PDF

82.6 KB Created: 2021-07-07 07:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf33167aa40b1c42864dca6ac3f94047 SHA-1: 68ae9279afd2db328420c93891cb52805350c9f6 SHA-256: 9654017cdd118378513177aed8bb749225ccd911b854528603bd17b50fb70b92
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=formula+for+calculating+correlation+coefficient PDF link annotation
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c904e740e6---suremit.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/50974030778.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8770dc594f---wovuniku.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/295627bbc4f40e6eb06b37e6c9da115b/gapotejaramifuwibi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5onnpnhn6b3m9boalp4a2g5gj2/75810461514.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072110a4cea8---15069451814.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/eb343fd351979a937dc4f5477d105685/40563210717.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qr89hfd8utl59u0nq0bsr6tndi/nirunezositigonerogut.pdfIn PDF document text
    • http://hak-al.com/resimler/files/98241508259.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zizakitexitetevixera.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ebcb7d871---farorenexubovulu.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/tabomvv8cugauono1gdi6knav1/bubiponixaguxonofe.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/zegivokuluve.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc19d651cd---58247848139.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/zesusejikaguberabefuxiba.pdfIn PDF document text
    • https://topupdana.com/contents//files/wivewaluwu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c90c03732ff---gijipezud.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/18939735340.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714728584ae---rabugixosenenizefotedakob.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/piwuripazafige.pdfIn PDF document text
    • https://steammining.com/userfiles/file/duzitulakebujotab.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/zumukigesoxisinisekavo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a1a9045bb1f7f439ab7a7f788ab22fdf/46847958047.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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 10588 bytes
SHA-256: e39b0470d70fb5d0d1d41bd5ac2c301bbe0a7f5a2e0a1a4bc0983f710b62fb48
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 17016 bytes
SHA-256: 850e0b688dc4c514f531a0d2409d3d6a0820b4225cb7ab9da5c8ed7b133ad259

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