Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ebc868458a2833…

MALICIOUS

PDF

84.9 KB Created: 2021-07-02 13:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4d19ebddb1d0d0cefb09d9df7f427b84 SHA-1: 5ac8af42974aed423a2e029fb0b1fc40f2917b03 SHA-256: f8ebc868458a28335296174a78376feb66f6f7cd7e48af0d2fabc7bb1e366aee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to numerous distinct hosts, some of which are associated with compromised CMS uploads. The document's structure and embedded links suggest an attempt to manipulate search engine results or lead users to malicious sites, rather than delivering direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://studiopignotti.it/userfiles/files/33835029091.pdf In PDF document text
    • http://bona-agra.pl/Upload/file/wotubigovuxatumelakum.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ebe326cc6ef1852582b435a1eff8c6b4/71625365400.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/lajuvosedu.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/gegitonitegezuvel.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/pokijivusizebafuva.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d22abdefddccf48b076c731c51bf7ea3/jevoxexezixuji.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d580fa9f9e---40169725302.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1801d01c97---27342749210.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/difaf.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/milibulolo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/bujanowajumopufabu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14cc2a374---48361199111.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/wogubowakegajiminixulare.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080819052e33---nebos.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f655609f---39246357007.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160789f08d58c3---59887584508.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/39798131365.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10af78ac0---rununedige.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pejanubakisogot.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/35166221824.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/99723807137.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/12168568688.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/15454793429.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/99618f42197105176a0e99d04dbc43b4/74706359657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=diffusion+material+sciencePDF 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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 17336 bytes
SHA-256: 001e0bc3a3240e545354c30133ccfd62f9dbe40e11ade183957d4191e8c6403e
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 10600 bytes
SHA-256: 34e8c5faa13152743e4b76bb2b3f28e616fc6e7d66bd85536144e53a211a610c

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