Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee50b9eafda16fa0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 16:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a303f22cd3325020af3ca3819280b30 SHA-1: 9edb72030194734c434f1626bfd6a0a732b0c078 SHA-256: ee50b9eafda16fa0cc107cb56a8211b465d6b9691151ffa9641b41c4e79ec541
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute additional malicious content or exploit vulnerabilities. The presence of numerous links pointing to compromised WordPress sites and disposable hosting further suggests a malicious intent, likely for hosting malware or redirecting users to phishing sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3d67de135---51403333339.pdf In PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jamekomuxowitodadusexof.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/tenudedasetu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e0d758d5a---94894711727.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/voxogomadalutejaxame.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/31208338995.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/nodaxerijagunavod.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/1646262393.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/vabupugam.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/vivex.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/36949652853.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53ca2b7be---27379392797.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c923355e81---pipuwifilabijonakijulod.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/libumixevikuvefosonizado.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/11012420215.pdfIn PDF document text
    • http://www.bash.cl/media/file/45661125741.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/zogexeroxajivu.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/3648232426.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/48837673599.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/22391c66689ea92e4a689135d06416bb/70633362497.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/hge4aro1qe4pkqeie4fauatc5t/58116606027.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/gozitikajolozagani.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/mipuwufipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=descriptive+word+beginning+with+cPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/tiwoxuvukixujetapufen.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_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16740 bytes
SHA-256: 8358aa2a210b9c5de84a55c4481c1aa4acc768d1e17990d136dde21a42d66aa1
font_02_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10880 bytes
SHA-256: b6ec2bd3e2fdcd0a63dc555e85a1f666a14833521a8879844baebb0bdf91986e

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