Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eecb8bf1de96056…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 15:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 235ab2aa07cdecee93c4d8c236c8fce4 SHA-1: d95f073c5d4264d72119388cd23111de1e4c3029 SHA-256: 2eecb8bf1de96056cf03d641c8728575dcd837958ab3fac6dd78d0c3f5105f56
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous links pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for further malicious content, potentially exploiting vulnerabilities in the user's browser or system. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mppscstudy.com/admin/usercontent/file/zomofitifipepokuzatizorek.pdf In PDF document text
    • http://wmc21.com/ckupload/files/niwegezizidogafifekaxoz.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3ef8019ce9bdd5ef7614bcfe0497ad33/545557854.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a22f3b40f6e---11849030275.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/geiiukakb869qkoe2h95hkgvh2/32472111118.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebfea5402b---44030454031.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ada37pivm61a6ksf5ij0jak9a7/xafaxopavogodapadedozaxe.pdfIn PDF document text
    • http://wernitznigg.at/files/80446027225.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/12777933068.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/26307897972.pdfIn PDF document text
    • https://bursac.net/userfiles/file/29123156223.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/60c9c78dffcfe408b144771806ea8a1d/15275899825.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8c827453---3929959936.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/vosagejazubajexasufin.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b277dba17e0---28657160706.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/32090834639.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/25171002140.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/laweserubebakobi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/lujakepufagaj.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c95035985---75988071113.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/pizaditatikufulop.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d12e61b4e6763969c63893a56b9ceba0/pekilefefaboxezobak.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/4f91jcip40l8pb9h0da62makdr/vazitasewanev.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/96613894911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=genetica+conceptos+basicos+pdfPDF 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_off0000be43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE43 10644 bytes
SHA-256: 15f995d8e17d2f598931df7339210f05857d660729f80a72b77791294dc2575b
font_01_sfnt_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 18088 bytes
SHA-256: 26f4277b0d62091b5909234a65f9643a50c8276991a42b4f341fd461e31ed899
font_02_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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