Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d283ecaab771608…

MALICIOUS

PDF

89.9 KB Created: 2021-09-04 01:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd5a5961eb6c7b382171fff0e787a922 SHA-1: 1690239dcbdbcf26486bd2a1d666f49fbb528dd4 SHA-256: 2d283ecaab771608bf8067083640d74b1be4b0885e648124e21fb53132d4e169
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=post+harvest+handling+of+cereals+pdf PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e44f302ca---46542990874.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070140f33ce1---96771613571.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810553f306d---71086288065.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78906975a1---pebofovotenojivapis.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083212b642d5---94493166814.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/73904239964.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/bezuragi.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/sitotogemukevukozujadage.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/bezafakodajupunidorep.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/faxajanu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f67fa2404488fc2d70c6db43b87c39b/68256290931.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a34a39430576d4c00add5fdf7af9aee/doxosotatejugometim.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/36699436062.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c56a26af09da6ade3c426054c4ddbf15/42305187166.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/furarirovitopun.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/vovaparoxuri.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/kasewosox.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160883dc5e27e9---kebajeneketagu.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/giboronafitabisevomefareb.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/wavikizuwuvil.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qr0cqpgao5i8esodmnuu4jvpv8/lijosega.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/vuvojomagodabomowures.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/fagejogufetovubozer.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/baxudemuro.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/84832554669.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_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 10964 bytes
SHA-256: 0ba7990b7fad16c6998001dde458c1edf6cf08d4b132e24a2f07ce7f6a161ab1
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 18464 bytes
SHA-256: 26e9887c7b7d7f0f5fc0df81c74a14155b56d0094f9ea61a7aa9796441a9ce07

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