Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b4601b057e85c0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 10:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3de438efef33010c5af81773d8fc71c SHA-1: 60f57db18f119cc192ccf58bbd77b7b65b31e8a5 SHA-256: 09b4601b057e85c0c8bf741f4661c1abe6bf72f6d2fdae03f151ee4a6cb6d110
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/95744802358.pdf In PDF document text
    • http://agecarekorea.com/ckupload/files/maxufokajegol.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/24469128162.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/13290413728.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/lewikuj.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/vowirobemonesam.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ebdd9e15---9179303814.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/27342061099.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/54145910540.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/46096040400.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/sapidizeso.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/67779423067.pdfIn PDF document text
    • http://baove24h.org/upload/files/19451249844.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/fitel.pdfIn PDF document text
    • https://btegypt.com/file/73020259379.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/8iq0g3smb1ko0mrmbe22nt760a/8080804457.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/97305319945.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba3f99a21---90294573131.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e9b05b694---67992848113.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/dirinemofegop.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/mikusegumar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+mobile+games+offline+freePDF 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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10752 bytes
SHA-256: 04b0913561692e83d147b310ad5b68cd8611e6006e98f2d26e9b3eb06c019e15
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 17528 bytes
SHA-256: 7117f025d840971d355af883175ad22fe5aedbcad0b0c86c3ed51d28c486fbc5
font_02_sfnt_off0001219d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1