Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5023acaa0a4eaf…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 06:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d4fdf044d16795a46196f8596e3c13a1 SHA-1: 4be1b349b37cf64b9e986866e1e2e3c6cf3b7fcd SHA-256: ec5023acaa0a4eaff5dbb40cf04cf7c6732fe0dc09f38380809b75f8fea88e12
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elektrostroy.kz/ckfinder/userfiles/files/86513008233.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/fiwurinog.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/voduvozozejet.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070869f6660a---15995956166.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/kidenuwog.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xavaripunineteket.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/noruxuzipipiwuxapalex.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcaa2595a6---jefubukubara.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/e8ed39f94a2a8ad18ace518f3ae8bcd8/bigevepun.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160718f8b1f121---22970569948.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/aeea8737283173df2643a64c9db82093/gepevufovedovid.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/90500031378.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/76885167301.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090094d5c21f---pimuta.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sh4vebvge1ekiipqpf5l220lf7/bimodeseteg.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bv8rmi58p8q46v9aaknj1ls7h7/77783220742.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ae745723f3df11df7c63fdc239c798bc/23895548766.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7aebe2cdb2c98e19eef9e1231e1ccb91/79966371815.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d5d463485a1c96089469ca490a4c0da6/fivurufezinegafutov.pdfIn PDF document text
    • https://arerp.kr/data/file///77831456923.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/xilebixodutipimokeropo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfab22b00d6---94603081905.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/dofug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manuale+d%27amore+2+full+movie+watch+onlinePDF 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 18220 bytes
SHA-256: ed169cb06ff031b80d478ea9d4256edae9c1ef6e3d880eecb0cbe5e1cff017c0
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 10972 bytes
SHA-256: 3176a0e302846b8a4b277ed66ed7c8073e0f4f95e94d79bb886a8d8f033cf5ec
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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