Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e54d97eacfa3ea…

MALICIOUS

PDF

192.7 KB Created: 2021-07-24 16:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4efc2a4a1df354e61f988544ed6ff39 SHA-1: ad1e49f8bf889c90bf7f1c7189595c74287cf369 SHA-256: b1e54d97eacfa3eac9ae7dd4dae5957cfa7bb8760eb329ad7c6e4f88a23a3e90
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This structure is indicative of a link farm, likely used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdf In PDF document text
    • http://yilip.net/userData/board/file/732972007.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079acb0c0830---tolezisigafusumavepipukaf.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eede5369---42039929425.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/84380051571.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/padetola.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3b4a29f33---xasuzidarexozaporizeve.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tomozevazujewepig.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/duvigovalan.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/kifixo.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/98518319213.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/redolazuluxuzusofi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64e8527424---70342702271.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lakjchibfpvedsou8c0bnv20lv/bobilosazade.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a44c51cbc---65956404843.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/35884400364.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wiwexorokubo.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a3d8d506d3ab6b0363ef0b1ed21e7c7d/65519359518.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t5fejmnu2g104l29k3iq2hu65t/92286925396.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gn8hmung9dm7bb05f122uaf2ge/gufexagijelijafa.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/96393173939.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/n3hfr7ukpn4enk9m933h4mpdo6/bunegomifujizuraz.pdfIn PDF document text
    • https://keongracun.org/contents//files/budomusogaxoteraroxir.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/ledotixigisaripewogijol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+sd+card+default+storagePDF 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_off00028dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002a5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A5DB 20276 bytes
SHA-256: 0d76b44c83778de5bbc72290db79a232af5662c98215eb195370a63c0a8ad859
font_02_sfnt_off0002db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB78 10892 bytes
SHA-256: 54a9fea8b783dadb85e0f492c05d19666adfba362e0c383fd8e828821863cacb

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