Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53d4a14c0f9601e…

MALICIOUS

PDF

93.1 KB Created: 2021-06-25 20:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e9a307cf57fea098c4703650d5f5d1d SHA-1: 9ce48c923b1f8dfbc246de57392d0f049feda695 SHA-256: d53d4a14c0f9601e7a0e311a741344c5cecf4dcdeceb059c2742d4b5387208ec
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier also flagged this PDF as malicious with high confidence. The primary function appears to be directing users to potentially malicious or compromised websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb5692329f---90220438409.pdf In PDF document text
    • https://isabellepieman.com/userfiles/file/pirawuwuloron.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/niwotisazobawidipe.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/30264164529.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/xejawolekejujusikapojor.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3837ddb2201b20811ae07600226b406d/47461715243.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/79518270815.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81ebf2128b1f9ec86face48c1f35654c/xudesoporosakititipiji.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b56095e1b48---xegapofu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/d3559314e3dd002af0964df5427ae9b0/47545814325.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/natova.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/42f7e1f95bd200a15c32d580cce89637/divigusamonej.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zazabotofugowutogavefog.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/a8626d025bdd4a8c55d827be58b4557e/mowidejajoxuwet.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607944fabc9c0---movisosobolopena.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/34621005351.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980e38046---jinuxadavusogases.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a50fa52b0---36188658784.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/samuwek.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/kupukapomaxerugelimu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2om80bt7583fhhsn687gda5e1m/8718730260.pdfIn PDF document text
    • http://coclub-us.com/ckupload/files/gojad.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ec0fc345af5678917a10dc101405a90e/kazanevabowugiwukam.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b97b4312dd3eacb0f9353de130f5b03f/28424248740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=which+amendment+is+the+most+importantPDF 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_off000109b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 17224 bytes
SHA-256: 743b02b428565d8a5351672cbb4452a0083473a6148a8f13470662c7cf38d162
font_01_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 10728 bytes
SHA-256: e52ac7fbb2d3fdb9f7708d701741526cedb5f6e9b72fb1de8f2ac6f176103f06
font_02_sfnt_off00014f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1