Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadd51a2384ef62c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-25 02:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce4149b5f5490999ad9b98f3b3671c9d SHA-1: a70ff2572f0d74c926a343af12e967d01ea7b310 SHA-256: cadd51a2384ef62caceef8bc7fa4e2635adcda8c7cca693dea94a0d58924cfc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

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://cukimentescukraszda.hu/files/files/daxebejexonexedosuxo.pdf
    • http://gyogytornasziget.hu/uploads/files/55188968536.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/48137238619.pdf
    • http://auroraenergyproject.it/userfiles/files/86451790847.pdf
    • https://thisissati.com/userfiles/files/zakabezebugufarisobixi.pdf
    • https://zenit-npk.ru/files/file/zabifapabokavomusuwo.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146b3faaec64---zovimuzofuwexox.pdf
    • https://campfun.myhost888.com/upload/ckeditor/files/97697569377.pdf
    • https://tsydesign.com/userfiles/jws/files/jenugekinijite.pdf
    • http://alocainghien.com/uploads/userfiles/file/22000733500.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tafef.pdf
    • http://krallarintavugu.com/upload/file/xoberapegarugulidek.pdf
    • http://carscaso.com/js/upload/files/pimusem.pdf
    • https://restaurant-kamkok.fr/img/Data/file/pawuzonetusosonakalaro.pdf
    • http://thesciencenetwork.org/uploads/files/tejesodidusexosawidodiju.pdf
    • http://jamesandsons.ca/userfiles/file/70680567771.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d740de71817bf39305629ea1a039f0be/bigikefebotafidimiwugeg.pdf
    • https://queensflower.nl/clientfiles/85482606997.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2a4ea5db49b1202a4e46cc9af480ac4/19324740236.pdf
    • https://mongolia-volkslift.com/uploads/files/60521949713.pdf
    • https://monographie.com/ckfinder/userfiles/files/87611432339.pdf
    • http://fishtech.org/uploads/userfiles/file/file/fakujuzexabirirado.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146638964856---xaviruvoxofa.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/sidowazimebexixi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=reset+phone+without+password
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bba5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA5 16792 bytes
font_01_sfnt_off0000d3bc.bin
87d4d20ec2b9e7aedbcc83b67fe361eea9cb2150d2fe9aad399bf13ecb5627bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 10676 bytes
font_02_sfnt_off0000ec3d.bin
f8b545d7edda1d06c8ae2371789ad838982616e24bc5af241bd0aa832777e9cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 18600 bytes