Malicious PDF — malware analysis report

Static analysis result for SHA-256 862a5bfd2d42a04e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 20:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5cfd3cf50210109dd3a0cd54c1bc797 SHA-1: ef1a8c984da2cc9444213906b48b47afd770494d SHA-256: 862a5bfd2d42a04e6bbc882216b8ddaf1be26eb0178dc50773c263cca8b932ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://lyna-garage.com/htdocs/cljr/data/files/5725829250.pdf In PDF document text
    • http://guanzhuli.com/userfiles/file/jobizigerobaridigev.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a481500bf9---vuxulutubojadaduka.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdac0ee46781aef5a1cb27e5b1615136/nalerewidetenulinor.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/63228151814.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/76515726440.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613f93854430e---radajuzo.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/63095585671.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/suzumod.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/89434297811.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/mobewodetirivakiram.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/xabonunevo.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130facc0fce3---gotifatevuxise.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/80284541577.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/3121899589.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136102f24d8a---mujoluba.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/41654517705.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/kikufanololirixezegaxijup.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/60986960566.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/99844870564.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/ketave.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/68226907812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+modded+apps+androidPDF 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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 10540 bytes
SHA-256: b017259c29263e1509e08643a4839cfb2922065631cecf077ec2ec89ee205fbc
font_01_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 16856 bytes
SHA-256: 8f2048e0eeb5bcec26e0e2d1a9a70f9d087655bf5545e9bef75ba950d7e6bb15
font_02_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1