Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eafcc67b879b14…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 07:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 36c59eb6c0579d891048a064cfe3915c SHA-1: 5bc7c5d8a3b474e1075db8d39314630027e04946 SHA-256: 87eafcc67b879b1478bbcb46c1c01066882d34b8b0cb716e90f79ff99a062eaf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://bloomland.com/sites/bloomland.com/files/feniwe.pdf In PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce30abbe69---21484203872.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/6636323776.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/jokegekuzevixijogasam.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba556830af6---xawedejotazujozaxupa.pdfIn PDF document text
    • http://scro.ru/pic/file/85824667426.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/65eebe7ed5ea41bf990946a618fceb43/59671001774.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/33943417253.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a631cc8fec0---15539810971.pdfIn PDF document text
    • https://ka-base.no/images_content/file/46405363461.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/16350898957.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/rafowinugoluteluraxij.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb326cae1---38604703685.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/sedexefafalebubiwufo.pdfIn PDF document text
    • http://tianfonmm.com/d/files/42441384280.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b118367b98e---89147120962.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f34dc86cd92---seboninijadajediganobo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d0b4753b1071c78b4a8ab02f716568f8/sogeju.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6dc7d3af46c16f44f92130f9c3f3709a/siwagisebupibib.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/xidamadatezejakowuz.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/68691358561.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/66c6cb80939e6e8afb81aea5caba799f/37905835928.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/latokufovutegejem.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2d87111143c37d23dd2f3a8c4e98c48b/25770229713.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/9936141839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+de+comprension+lectora+para+segundo+grado+de+primaria+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_off0000e018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 19404 bytes
SHA-256: cde9b85d6465cd8f8ec5e4c77de102bded5ca310e8ec88fc9903d98e694d9488
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 11176 bytes
SHA-256: 15ad712c90ca92e19adf5964188a46dc29b9bca214ffc4c3afb6132c9403f6b0